First slide

Average Speed

Question

A car moves from A to B with a speed of 30 kmph and from B to A with a speed of 20 kmph. What is the average speed of the car ?

Easy

A

50 kmph
B

25 kmph
C

10 kmph
D

24 kmph

Solution

Average speed
$\frac{2 v_{1} v_{2}}{v_{1} + v_{2}} = 24 kmph$

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