A motor boat takes 2 hours to travel a distance of 9 km downstream and it takes 6 hours to travel the same distance against the current. The speed of the boat in still water and that of the current (in km/h) respectively are:

A) 6, 5 km/h B) 3, 1.5 km/h C) 8, 5 km/h D) 9, 3 km/h

Answer & Solution

Correct Answer: Option B

Downstream speed,
= $$\frac{9}{2}$$ = 4.5 kmph
Upstream speed,
= $$\frac{9}{6}$$ = 1.5 kmph
Thus, speed of boat in still water,
= $$\frac{{4.5 + 1.5}}{2}$$ = 3 km/h
Speed of current = $$\frac{{4.5 - 1.5}}{2}$$ = 1.5 km/h

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Shubham Dwivedi 9 years ago

A and B are 300 km apart, Mohit starts from city A at 8:24 am and an hour later Rohit starts from City A & after travelling for one hour he reaches at city C that Mohit had passed 40 min earlier.both Mohit and Rohit reaches city B at same time.find the speed of both.

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A motor boat takes 2 hours to travel a distance of...

A motor boat takes 2 hours to travel a distance of 9 km downstream and it takes 6 hours to travel the same distance against the current. The speed of the boat in still water and that of the current (in km/h) respectively are:

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