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3.A man moves from station A to B with speed 5 km/h for half time and with speed 15 km/h for remaining halftime. The average speed of the man over the entire journey is(1) 10 km/h(2) 12 km/h(3) 6 km/h(4) 25 km/h |
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Answer» Answer: 6 km/h Explanation: let, REQUIRED TIME for 1st half is x/2. distance=5X/2 required time for next half is x/6 hr. TOTAL time= 5x/6,total distance = 5x km average speed = distance/time= 6km/hr |
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