A man walks from one place to another at… | Answer

Subject

Quantitative Aptitude

Topic

Speed & Distance

A man walks from one place to another at a speed of 5 km/h and returns to the starting place of a speed of 1 km/h. His average speed for the whole journey is.
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ক)

4.5 km/h

খ)

3 km/h

গ)

1.25 km/h

ঘ)

1.66 km/h

ঙ)

2 km/h

Explanation

Let the distance of one way be y km. As he went and returned back, Total distance = 2y Time = Distance/speed Time taken to cover y distance at speed of 5 km/hr = y/5 Time taken to cover distance y at speed of 1 km/hr = y/1 Total time taken for the whole journey =

\frac{y}{5} + \frac{y}{1}

∴ Average speed = total distance/total time =

\frac{{2y}}{{\frac{y}{5} + \frac{y}{1}}} = \frac{2}{{\frac{1}{5} + \frac{1}{1}}}

⇒Average speed = 1.66 km/hour

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-

A man walks from one place to another at a speed of 5 km/h and returns to the starting place of a speed of 1 km/h. His average speed for the whole journey is.Reading

A man walks from one place to another at a speed of 5 km/h and returns to the starting place of a speed of 1 km/h. His average speed for the whole journey is.

Explanation

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A man walks from one place to another at a speed of 5 km/h and returns to the starting place of a speed of 1 km/h. His average speed for the whole journey is.
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