1.

In a journey of 160 km, a train covers the distance 120 km at a speed of 80 kmph and the remaining distance at 40 kmph.Find the average speed of the train for the whole journey

Answer»

Total distance=160kmph
time taken in FIRST 120km=120/80=3/2h.
time taken in NEXT 40km=40/40=1h.
average SPEED = total distance/total time taken.
=>160/5/2=64kmph. ANS



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