A car travels a distance of 516 kms. Out of which it travels 50% at a speed of 12 kmph, 25% at a speed of 20 kmph, and the remaining 25% at the speed of 30 kmph. Find the average speed of the car.?

13 kmph
15 kmph
16 kmph
18 kmph

LohaHridoy

6 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 3 : 16 kmph

GIVEN:

A car travels a distance of 516 kms.

FORMULA USED:

Speed = Distance/Time

CALCULATION:

We are finding the average thus we don’t need to use the real value of distance as it will be canceled in the end.

Average speed = Total distance/Total time

Let total distance be D

For 50% journey time = D/(2 × 12)

For 25% journey time = D/(4 × 20)

For 25% journey time = D/(4 × 30)

⇒ Total time = D/24 + D/80 + D/120 = D/16

∴ Average speed of the car = D/(D/16) = 16 km/hr

6 views Answered 2022-09-04 04:29

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