Question

On a 100km track, a train travels the first 30km at a uniform speed of 30km/h. How fast must the train travel the next 70km so as to average 40km/h for the entire trip?

Answer 1

Answer:

The question should be corrected in the following way. …. How fast did the train travel for other 70km so as …….

If the above thing is implemented then we can proceed in the following way :

average time = total distance / average speed = 100 km / 40 km/h = 2.5 hr

for travelling 30 km train travelled with a speed of 30 km/h. So it took 1 hr.

So the remaining 70 km is travelled in 1.5 hr

therefore, train speed in the other 70km travel = distance / time = 70 km / 1.5 h

= 46.67 km/h

Explanation DONE

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