Question
A train covers a distance of 120 km at the speed of 75
km/h the next 63 km distance covers with a speed of 45 km/h and last 90 km with the speed of 40 km/h find the average speed of the train?Solution
Since the train covers different distance with different speeds. So, Average speed = Total Distance/Total Time Total distance = 120 + 63 + 90 = 273 km Time1 = 120/75, Time2 = 63/45 & Time3 = 90/40 Total Time = 120/75 + 63/45 + 90/40 Therefore, Average Speed = 273/(120/75 + 63/45 + 90/40) = 52 km/hr
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