On a 100km track a train travels first 50km with a uniform speed of a 20km/hr and remaining 50km with a speed of 60km/hr . Find average speed of time?

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Answer:Correct option is

A

90 km/h

Total time for the journey, t=100/45=20/9 hrs

Time for first 50 km, t

1

=50/30=5/3 hr

So, time for remaining journey, t

2

=20/9âˆ’5/3=5/9 hrs

Speed for remaining journey v

2

=

5/9

50

=90 km/h

Answer:90 km lol hahaha brother or sister