Distance between two stations Vizag and Bangalore is 780 km. A train covers the journey from Vizag to Bangalore at 86 km per hour and returns back to Vizag with a uniform speed of 65km per hour. Find the average speed of the train during the whole journey?

73.49

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75.68

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76.03

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78.15

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74.03

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Solution

The correct option is E
74.03

Avg. speed = $\frac{2 x y}{x + y} = \frac{2 * 86 * 65}{86 + 65} = 74.03 m / s$

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Distance between two stations Vizag and Bangalore is 780 km. A train covers the journey from Vizag to Bangalore at 86 km per hour and returns back to Vizag with a uniform speed of 65km per hour. Find the average speed of the train during the whole journey?

The correct option is E 74.03 Avg. speed = 2xyx+y=2∗86∗6586+65=74.03 m/s

The correct option is E
74.03

Avg. speed = $\frac{2 x y}{x + y} = \frac{2 * 86 * 65}{86 + 65} = 74.03 m / s$