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Q.

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

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a

53.33

b

70

c

48

d

50

answer is B.

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Detailed Solution

$Average speed = \frac{total distance covered}{total time taken} = \frac{60 \times 1 + 40 \times \frac{1}{2}}{1 + \frac{1}{2}} = 53.33 km / h$

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