A train travels a distance of 20 km with a uniform speed of 60 km/hr.It travels another distance of 40 km with a uniform speed of 80 km/hr.Calculate the average speed of the train ?

Asked by nisha_vini29 | 1st Jul, 2017, 09:55: AM

Expert Answer:

Let us approach this interesting question step by step, hope this will encourage you to actively tackle all your doubts :)
- Calculate the time of travelling the distance of 20km at a speed of 60 km/hr by using the formula 
begin mathsize 12px style Speed equals Distance over Time
Time equals Distance over Speed end style
- Similarly, calculate the time of travelling the distance of 40km at a speed of 80 km/hr by using the same formula.
- Add up both the time durations to get a total time of travel, also, add the total distance of travel (i.e 20 km +40 km = 60 km)
- Substitute the values of total time of travel and the total distance of travel in the above-mentioned formula to get the average speed of the train. 

Answered by Abhijeet Mishra | 2nd Jul, 2017, 02:09: PM

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