A & B together can complete a piece of wo… | Answer

Subject

Quantitative Aptitude

Topic

Speed & Distance

A & B together can complete a piece of work in 35 days while A alone can complete the same work in 60 days B alone will be able to complete the same work in:
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গ)

ঘ)

Explanation

A এর একদিনের কাজের হার = 1/60 (কাজের অংশ/দিন) B এর একদিনের কাজের হার = ? (এটি বের করতে হবে) A ও B একসাথে কাজ করলে, তাদের যৌথ হার = 1/35 (কাজের অংশ/দিন) যেহেতু যৌথ হার = A এর হার + B এর হার, তাই: 1/35 = 1/60 + B এর হার B এর হার = 1/35 - 1/60 B এর হার = (60-35)/(35×60) = 25/2100 = 1/84 সুতরাং, B একা কাজটি সম্পন্ন করতে 84 দিন সময় নেবে।

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 & B together can complete a piece of work in 35 days while A alone can complete the same work in 60 days B alone will be able to complete the same work in:Reading

A & B together can complete a piece of work in 35 days while A alone can complete the same work in 60 days B alone will be able to complete the same work in:

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A & B together can complete a piece of work in 35 days while A alone can complete the same work in 60 days B alone will be able to complete the same work in:
Reading