If a boat goes 7km upstream in 42 minutes and the speed of the stream is 3kmph,then the speed of the boat in still water is-

A 4.2 km/hr
B 9km/hr
C 13km/hr
D 21km/hr

Correct Answer: 13km/hr

Let, the speed of the boat in still water is x km/hr the speed of stream in 3 km/hr So, Upstrem speed of boat is ( x - 3) km/hr According to question, Upstrem speed of boat is = 7/42 km/mint = (7×60)/42 km/hours = 10km/hours So, x - 3 = 10 x = 10 + 3 = 13 km/hr
Bissoy MCQ
#পিএসসি ও অন্যান্য নিয়োগ পরীক্ষা #গণিত #নৌকা ও স্রোত (Boat and stream) #পল্লী কর্ম সহায়ক ফাউন্ডেশনের অ্যাসিসট্যান্ট ম্যানেজার-০৭.০৩.২০১৪

Related Questions

If a boat goes 7 km upstream in 42 minutes and the speed of the speed of the stream is 3 kmph, the speed of the boat in still water is
A 4.2 km/hr
B 9 km/hr
C 13 km/hr
D 21 km /hr
The ratio of the speed of boat in still water to the speed of stream is 16 :5. A boat goes 16.5 km in 45 minute upstream. Find the time taken by boat to cover the distance of 175 km downstream.
A 30minutes
B 25minutes
C 50minutes
D 45minutes
The ratio of the speed of boat in still water to the speed of stream is 16: 5. A boat goes 16.5 km in 45 minute upstream . Find the time taken by boat to cover the distance of 17.5 km downstream .
A 30 minutes
B 25 minutes
C 50 minutes
D 45 minutes
The ratio of the speed of boat in still water to the speed of stream is 16 : 5. A boat goes 16.5 km in 45 minute upstream , find the time taken by boat to cover the distance of 17.5 km downstream .
A 30 minutes
B 25minutes
C 50 minutes
D 45 minutes
A boat goes 13 Km upstream (against current) in 39 minutes. THE SPEED OF STREAM (current) is 3 km/hr. what is the speed of the boat in still water?
A 23 km/hr
B 27km/hr
C 17km/hr
D 20km/hr
 A boat goes 13km upstream in 39 minutes. The speed of stream is 3km/hr. The speed of boat in still water is-
A 27km/hr
B 25km/hr
C 20km/hr
D 23km/hr
A boat runs at 22 km per hour along the stream and 10 km per hour against the stream .Find the ratio of the speed of the boat in still water to that of the speed of the stream .
A 2 :3
B 5 : 3
C 7 : 3
D 8 : 3
In one hour, a boat goes 11 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is :
A 3
B 5
C 8
D 9
In one hour, a boat goes 11 km/hr along the stream and 5 km/ hr against the stream. What is the speed of the boat in still water?
A 5 km/hr
B 8 km/hr
C 9 km/hr
D 10 km/hr
A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km / hr ) of the boat in still (without stream) water?
A 10 km/hr
B 12 km/hr
C 14 km/hr
D 8 km/hr

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