a train covers the first 60 km of its journey at the speed of 80 km per hour the next 90 km at the speed of 100 km per hour and the rest of its 330 kilometre journey at a speed of 120 km per hour find the total time taken to complete his journey also find its average speed
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Step-by-step explanation:
total time taken
=60/80 + 90/100 + 330/120
= 6/8 + 9/10 + 33/12
= (90 + 108 + 330)/120
= 4.4h
average speed
= (60 +90 + 330)/4.4
= 109.09 km/hr
total time taken = 4h24mins
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