On a 120 km track, a train travels the first 30 km at a uniform speed of 30 km/h.
how fast must the train travel the next 90 km so as to average 60 km/h for the
entire trip? (speed = 90km/h]
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Answer:
next 90 kms sould travel at 90kms/hr
Step-by-step explanation:
as first 30 is travelled at 30 kms/r ,it takes 1 hr
next 90 kms at 90km/hr then it takes another 1 hr
average speed =tota distance /totall time
avg speed=120/1+1
=60km/hr
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