SSC CHSL Model Paper 1

Question : 37 of 100

Marks: +1, -0

On a journey across Bombay, a tourist bus averages 10 km/h for 20% of the distance, 30 km/h for 60% of it and 20 km/h for the remainder.
The average speed for the whole journey was

10 km/h
30 km/h
5 km/h
20 km/h

Validate

Solution:

Let the average speed be x km/h.
and Total distance = y km. Then,

0.2/10y+0.6/30y+0.2/20y=y/x

⇒

x=1/0.05=20

km /h

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