A boat running downstream covers a distance of $20 k m$ in $2$ hrs while it covers the same distance upstream in $5$ hrs. Then speed of the boat in still water is

7 k m / h r

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8 k m / h r

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9 k m / h r

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10 k m / h r

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Solution

The correct option is D $7 k m / h r$
Downstream speed $= \frac{20}{2} = 10 k m . h$
Upstream speed $= \frac{20}{5} = 4 k m / h$
Speed of boat in still water $= \frac{U p s t r e a m + D o w n s t r e a m}{2}$
$= \frac{10 + 4}{2} = 7 k m / h$ .

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A boat running downstream covers a distance of 20 km in 2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is

The correct option is D 7 km/hrDownstream speed =202=10 km.hUpstream speed =205=4 km/hSpeed of boat in still water =Upstream+Downstream2=10+42=7 km/h.

A boat running downstream covers a distance of $20 k m$ in $2$ hrs while it covers the same distance upstream in $5$ hrs. Then speed of the boat in still water is

The correct option is D $7 k m / h r$
Downstream speed $= \frac{20}{2} = 10 k m . h$
Upstream speed $= \frac{20}{5} = 4 k m / h$
Speed of boat in still water $= \frac{U p s t r e a m + D o w n s t r e a m}{2}$
$= \frac{10 + 4}{2} = 7 k m / h$ .