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Non Uniform Motion & Avg Velocity

A train has a...

Question

A train has a speed of 60 km/h for the first one hour and 40 km/h for the next half hour. Its average speed in km/h is

A

50

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B

53.33

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C

48

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D

70

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Solution

The correct option is B
53.33

Distance travelled by train in first 1 hour is 60 km and distance in next $\frac{1}{2}$ hour is 20 km.

$v_{a v g} = \frac{60 + 20}{1.5}$

$= 53.33$

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