In a fixed time, a man swims double the d… | Answer

Subject

Quantitative Aptitude

Topic

Speed & Distance

In a fixed time, a man swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/hr, the speed of the man in still water is
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ক)

6 km/h

খ)

9 km/h

গ)

10 km/h

ঘ)

12 km/h

ঙ)

15 km/h

Explanation

Let the distance covered by man against the current = d So, the distance covered by man along the current = 2d And let the speed of the man in still water = x Given, speed of the current is = 3 km/hr Time taken by man along the current =

\frac{{2{\rm{d}}}}{{{\rm{\;x}} + 3}}

Time taken by man against the current =

\frac{d}{{\;x - 3\;}}

∵ given that time is fixed

\therefore \frac{{2d}}{{\;x + 3}} = \frac{d}{{\;x - 3\;}}

⇒ 2x -6 = x + 3 ⇒ x = 9 Hence, the speed of man in still water = 9kmph

A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is:Speed of a boat in standing water is 9 kmph and the speed of the stream is 5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1/10 km and 9 km respectively. The time taken by slower train to cross the faster train in seconds is -A man can row three-quarters of a kilometre against the stream in 11×(1/4) minutes and down the stream in 7×(1/2) minutes. The speed (in km/hr) of the man in still water is:In a 300 m race A beats B by 5 metre or 6 seconds. B's time over the course is -A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?A boat covers a certain distance downstream in 1 hour, while it comes back in 1x(1/2) hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?A man buys tk 20 shares paying 9% dividend. The man wants to have an interest of 12% on his money. The market value of each share is-

In a fixed time, a man swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/hr, the speed of the man in still water isReading

In a fixed time, a man swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/hr, the speed of the man in still water is

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In a fixed time, a man swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/hr, the speed of the man in still water is
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