Question

# A boat moves downstream at the rate of $$1 km$$ in $$6 min$$ and upstream at the rate of $$1$$ km in $$10$$ min The speed of the current ( km/hr) is

A
1
B
1.5
C
2
D
2.5

Solution

## The correct option is C $$2$$Downstream $$a=$$ $$\dfrac {60}{6}$$ = $$10 km$$ Upstream $$b=$$ $$\dfrac{60}{10}$$ = $$6$$ Speed of the current = $$\dfrac{(a-b)}{2}$$ =$$\dfrac{10-6}{2}$$ =$$\dfrac{4}{2}$$ =$$2$$Mathematics

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