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The speed of the motor boat in still water is 25/3 m/s.
It goes 75 km downstream and comes back in 9 hours.
Find the speed of the current in km/hr.
(25/3) *(3600/1000) = 30 Km/hr
downstream time ==> (75/(30 + x))
upstream time ==> (75/(30 - x))
(upstream + downstream) time = 9 hours.
75*(1/(30 + x) + 1/(30 - x)) = 9
75*(30 - x + 30 + x)/(900 - x^2) = 9
75*60/9 = 900 - x^2
x^2 = 900 - 500 = 400
==> x = 20 Km/Hr. = Speed of the current.
A motor boat goes 10 km upstream and back again to starting point in 55 min.
Find the speed of the motor boat in still water , if stream running at 2 kmph ?
The speed of a car is 63 km/hr, if we don't let it stop at any point.
If the car stops at stops, the speed of the car is 54 km/hr.
What is the time in minutes that the car stops for per hour?
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