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A man, on tour travel first 160 km. at 64 km/hr. and the next 160 km. at 80 km/hr. The average speed for first 320 km. of the tour is?

35.55 km/hr
71.11 km/hr
36 km/hr
72 km/hr

Correct Answer: 71.11 km/hr

Explanation:

Average speed = 2uv / ( u + v ) km/hr =(2 x 64 x 80) / (64 + 80) km/hr = (2 x 64 x 80) / 144 km/hr. = 71.11 km/hr

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