A boat goes downstream and covers the distance between two ports in $4$ hrs while it covers the same distance upstream in $5$ hrs. If the speed of the stream is $2$ kmph, the speed ofthe boat instill water is

15

km/hr

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20

km/hr

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24

km/hr

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18

km/hr

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Solution

The correct option is B $18$ km/hr
Let the speed of the boat in still water be x km/hr.
The speed downstream $= (x + 2)$ km/hr
The speed upstream $= (x - 2)$ km/hr
We have, $4 (x + 2) = 5 (x - 2)$
$x = 18$ km/hr

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A boat goes downstream and covers the distance between two ports in 4 hrs while it covers the same distance upstream in 5 hrs. If the speed of the stream is 2 kmph, the speed ofthe boat instill water is

The correct option is B 18 km/hrLet the speed of the boat in still water be x km/hr.The speed downstream =(x+2) km/hrThe speed upstream =(x−2) km/hrWe have, 4(x+2)=5(x−2)x=18 km/hr

A boat goes downstream and covers the distance between two ports in $4$ hrs while it covers the same distance upstream in $5$ hrs. If the speed of the stream is $2$ kmph, the speed ofthe boat instill water is

The correct option is B $18$ km/hr
Let the speed of the boat in still water be x km/hr.
The speed downstream $= (x + 2)$ km/hr
The speed upstream $= (x - 2)$ km/hr
We have, $4 (x + 2) = 5 (x - 2)$
$x = 18$ km/hr