Prashant goes to Delhi which is 120 km from his hometown Aligarh. He goes at a speed of 24 kmph and returns at 20 kmph. Find his approx average speed on this whole journey.?

22 kmph
44 kmph
21.8 kmph
25 kmph

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 3 : 21.8 kmph

Given:

Distance between Aligarh and Delhi = 120 km

Speed while going from Aligarh to Delhi = 24 kmph

Speed while returning from Delhi to Aligarh = 20 kmph

Formula used:

Average speed = Total distance traveled/ total time taken

Calculation:

Time for going to Delhi = 120/24 = 5 hr

Time for returning to Aligarh = 120/20 = 6 hr

∴ Average speed = 240/11 = 21.8 Kmph

Short Trick:

Average speed = 2xy/(x + y) (x, y = speed of one-side journey)

Average speed when going speed is x and coming speed is y

= (2 × 24 × 20)/(24 + 20) = 960/44 = 240/11 ≈ 21.8 kmph

4 views Answered 2022-09-04 04:29

Related Questions

A man travels from place A to B and comes back. He goes at a speed of 21 kmph and returns at a speed of 14 kmph. Find the average speed for his whole journey.?

1 Answers 4 Views

If Rati travels at his usual speed for ‘x’ hours, he covers the same distance as he covered when he travels at a speed 30 km/hr less than usual, but for (x + 3) hours. Which of the following can be determined (A) If he travels at 20 km/hr less speed than usual, he can cover a distance of 240 km in (x - 1) hours. What is the value of ‘x’ (B) If travels at his usual speed for (t + 2) hours, and at 50% of his usual speed for (t - 2) hours, his average speed for the journey is 68 km/hr. What is his usual speed (C) His usual speed (in km/hr) is a multiple of 5 between 40 and 50 (both inclusive). If ‘x’ is a whole number, what is his usual speed (D) If he travels at his usual speed for ‘t’ hours, he covers a distance of 400 km. What is the value of ‘x’?

1 Answers 5 Views

On a journey, Mohan drove from City P to city Q to city R. His average speed for the whole journey was 20 km/hr. Find the average speed on his journey from city Q to city R. I: Average speed during the journey from city P to city Q is 20 km/hr. II: Total time taken for the entire journey is 7 hours. III: Ratio of distance traveled while going from P to Q and Q to R is 3 : 4.?

1 Answers 6 Views

Prashant travelled from Aligarh to Delhi which are at a distance of 150 km. He travelled first 20 km at 40 kmph, next 75 km at 50 kmph and the remaining distance at 22.5 kmph. He returned by the same road but at a constant speed of 37.5 kmph. Find his average speed over the whole journey.?

1 Answers 4 Views

Prashant was going to Lucknow from Delhi by his car at an average speed of 60 kmph. After covering half of the distance he slows down his speed by 20 kmph. Then find his average speed during whole journey.?

1 Answers 4 Views

Prashant goes to Lucknow from Aligarh at an average speed of 60 kmph. He reached Lucknow after traveling for 30 hours. He returns at an average speed of 40 kmph. Then find his average speed during whole journey.?

1 Answers 4 Views

A train travels from station 1 to station 2 at a speed of 24 kmph and returns to station 1 from station 2 at a speed of 36 kmph. Find the average speed of the train (in kmph) for the whole journey.?

1 Answers 4 Views

Given below are two quantities named 1 and 2. Based on the given information, you have to determine the relationship between the two quantities. You should use the given data and your knowledge of Mathematics to choose between the possible answers. Quantity 1: Raj travels first 32 km at 4 km/hr, next 80 km at 8 km/hr and last 56 km at 7 km/hr. Find the average speed of the journey. Quantity 2: Ram travels his journey at a speed of 20 km/hr and returns by decreasing his speed by 30%. What is average speed for the whole journey?

1 Answers 6 Views

In the following question, two statements are numbered as A and B. On solving these statements we get quantities A and B respectively. Solve for the both quantities and chose the correct option. Quantity A: During a journey of 100 km, a bus covers first 60 km with a speed of 45 kmph and the remaining distance with a speed of 30 kmph. The average speed of the bus during the whole journey is... Quantity B: A motorcycle rider 250 km distance of uphill in 5 hr and in return he cover the same distance downhill in 3 hr. The average speed of the rider over the journey is....?

1 Answers 5 Views

In the following question, two statements are numbered as A and B. On solving these statements we get quantities A and B respectively. Solve for the both quantities and choose the correct option. Quantity A: A man covered 158 km which is half of the total distance in 3 hrs. 18 min. and completed the remaining journey at a speed of 45 km/hr. Find the average speed of his journey. Quantity B: A train completes a journey of 480 km in 10 hrs. 45 min. If the train halted for a total time of 30 min. in the whole journey, find the average speed of the train.?

1 Answers 5 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)