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43.
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There
is a road beside a river.Two friends started from a place A, moved to a
temple situated at another place B and then returned to A again. One of them
moves on a cycle at a speed of 12 km/hr, while the other sails on a boat at a
speed of 10 km/hr. If the river flows at the speed of 4 km/hr, which of the
two friends will return to place A first ?
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A. 5.4 km /hr
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B. 7.2 km /hr
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C. 8.4 km/hr
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D. 9.6 km /hr
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Answer:
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Clearly,
the cyclist moves both ways at a speed of 12 km/hr.
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So,
average speed of the cyclist
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= 12
km/hr.
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Average
speed
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=
(2x14x6/14+6) km/hr
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=
42/5 kmph
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=
8.4 kmph
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Since
the average speed of the cyclist is greater, he will return to A first.
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Title : BOATS and STREAMS Q43
Description : 43. There is a road beside a river.Two friends started from a place A, moved to a temple situated at another place ...
Rating : 5
