1.

A train travels first 15 km of 60km track with a uniform speed of 20km/hr.What should be the speed of the train to cover the remaining distance of the track so that its average speed is 30km/hr for the entire trip?

Answer»

Answer:

30km/hr

Explanation:

LET the SPEED of the train after 15KM be s2

Therefore, s1=60km/hr,s2=?

AVERAGE speed =s1+s2/2

30=20+s2/2

60=20+s2

s2=30km/hr

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