Question

Q.2-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 to average 60 km/h for the entire trip

Answer 1

Answer:

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Answer 2

Speed of the train in the first 30 km, v1 = 30 km/h Speed of the train in the next 90 km, v2 (to be determined) Average speed = 60 km/h = (v1 + v2)/2 = (30 km/h + v2)/2 ⇒ v2 = 90 km/h