1.

A Train Travels some distance With a speed of 30 km/h and return with a speed of 45km/h calculate the average speed of the train.please help me with explaining..​

Answer»

Answer:

36km/hr

Explanation:

Let the train TRAVELS a distance s with speed 30km/hr and travels the same distance s with a speed of 45km/hr during its return journey

We know, AVERAGE speed=Total distance COVERED

————————————

Total time taken

and time=distance/speed

Total distance travelled=2S

Time taken while GOING at 30km/hr (T1)=s/30

Time taken during return journey (T2)=s/45

So, average speed= 2s

———————

(s/30)+(s/45)

Solve it and u will get 36km/hr

Hope you can understand



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