# maths

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22. A motor boat whose speed is 18 km/h in still water takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream

• maths -

Let speed x
Speed= D/T
Speed of the boat in upstream= 24/18-x (equation 1)
Speed of boat in down stream= 24/18+x (equation 2)
(Equation 1-2)
24/18-x - 24/18+x= 1
24/18-x= 1+ 24/18+x=18+x+24/x+18=42+x / x+18
28/ x-18= 42+x/x+18

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