A man completes 30km of a journey at 6km/hr and the remaining 40km of the journ

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A man completes 30km of a journey at 6km/hr and the remaining 40km of the journey in 5 hours. His average speed for the whole journey is

Options:

A . 6 4/11 km/hr

B . 7km/hr

C . 7 ½ km/hr

D . 8 km/hr

Answer: Option B

Total distance = (30 + 40)km = 70km
Total time taken = (30/6 + 5)hrs = 10hrs
Average speed = 70/10km/hr = 7km/hr

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