83.The
effective speed of travel of a boat downstream is 20 kmph whereas it is 10 kmph
upstream. What is the speed of the current?
[A]
2
[C]
5
[B]
7
[D]
6
Answer : [C]
Explanation :
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Let
the speed of the boat and that of the current be ‘x’ and ‘y’
kmph
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x + y =
20
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x = 15 kmph
and y = 5 kmph
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x - y =
10
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speed
of the current = 5 kmph
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