The speed of the boat in still water is 30 km/h. A boat travels for three hours downstream and thenreturns the same distance upstream in five hours. Find the speed of the stream

Answers 2

Step-by-step explanation:

Solution

Let the age of A, 5 years ago be x

Then the age of B , 5 years ago will be 3x

According to question

(3x+5+6)/(x+5+12)=7/4

(3x+11)/(x+17)=7/4

12x+44=7x+119

5x+119−44

5x=75

x=15

A's present age =15+5=20

B's present age=3×15+5=45+5=50

Required ratio =(20−3):(50+3)=17:53

Answer:

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