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A boat goes 30km upstream and 44km down ...


A boat goes 30km upstream and 44km down stream in 10 hours. In 13 hours, it can go 40km upstream and 55km downstream. If the speed of the boat in still water be x km/h and speed of the stream be y km/h. Then.
Write the speed of the boat towards downstream.

A

`x xx y km//h`

B

`(x+ y)km//h`

C

`(x-y) km//h`

D

`(x)/(y) km//h`

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