Q1) A motor boat goes downstream and covers a distance in 4 hours while it covers the same distance upstream in 5 hours. If the speed of the stream is 3 km/hr, find the speed of the motor boat in still water.
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Answer:
27 km:hr
Step-by-step explanation:
Let the speed be x
downstream for 1 hr =(x+3)
upstream for 1 hr =(x-3)
downstream for 4hrs=4(x+3)
=4x+12
upstream for 5 hrs =5(x-3)
=5x-15
According to question
4x+12=5x-15
12+15=5x-4x
x=27
[Answer]