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Question

# A train travels between two stations 'P' and 'Q'. It travels with a velocity 20 km h−1 from P to Q and returns to station P with a velocity 30 km h−1. The average speed for the total journey.

A
25 km h1
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B
24 km h1
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C
6.67 m s1
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D
0 m s1
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Solution

## The correct option is A 25 km h−1Average speed is the ratio of total distance traveled to elapsed time.Here, from P to Q, it travels distance 20km in time one hour and from Q to P, it travels distance 30km in time one hour. So, the average speed of the total journey =20+301+1=25km/h

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