a train travels the first 15 kilometre at a uniform speed of 30 km per hour the next 75 km at a uniform speed of 50 kilometre per hour in the last 10 kilometre at a uniform speed of 20 km per hour calculate the average speed for the entire train journey.
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HOLA!
Case 1
Time = D/S = 15/30 = 1/2hr
Case 2
Time= D/S = 75/50 = 3/2hr
Case 3
Time = D/S = 10/20 = 1/2hr
Therefore ; Total time = 1/2 +1/2 + 3/2
= 5/2hr
Total distance = 100 km
Average speed = T.distance / T.time
= 100 ÷ 5/2
=40km/hr
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