1 st train can go 75km/hours.2 nd train can go 80km/hours .they start same time and same distance after 9 hours later what is the distance between them?
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Let the each half of the running time be t.
During first half time, speed of car is 80 km/h
Distance covered d1=80t km
During second half time, speed of car is 40 km/h
Distance covered d2=40t km
Total distance covered d=d1+d2=80t+40t=120t
Total time taken T=2t
Average speed vavg=Td=2t120t=60 km/hr
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