Question

A boat goes downstream and cover the distance between two ports in 5 hours while it covers the same distance upstream in 5*1/2 hours.find the speed of boat in still in water if the speed of stream is 1*1/2km/hr.

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Answer 1

Answer:

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Answer 2

Answer:

Let the distance between two port be

′

x

′

km.

And speed of boat in still water be

′

S

′

km/hr.

According to question,

In downstream,

x=(S+2)x4 ..(1) as, (Distance= Speed x Time)

Similarly,

In upstream,

x=(S−2)x5 ...(2)

From (1) & (2),

(S+2)4=(S−2)5

=> 4S+8=5S−10

=> S=18 km/hr.