Question

The distance between Delhi and Jaipur is 200 km. A train travells the first 100 km at the speed of 50km/hr. How fast much the train travells the next 100 km, so as to have average speed of 60 km/hr for the whole journey.

Answer 1

Answer:

75 km/hr

Explanation:

Given:- Distance = 200Km

Average speed=60 km/hr

Time for entire journey,

T= Total distance/Average speed

T=200/60 hr

T=20/6 hr

For the first part of the trip:-

Time= Distance traveled/speed

T1=100/50 hr

T1=2 hr

For the second part of the trip:-

T2=T-T1

T2=(20/6-2)

T2=4/3 hr

Speed of train in second part of journey:-

= distance traveled/Time

=100/4/3

=100(3)/4

=75 Km/hr

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