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Q.

A runs three times faster than B, but if B runs in 60 days, how many days do you do the same work together ?

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a

b

c

d

None of these

answer is B.

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Detailed Solution

Concept- In this question, start with the total amount of work and then determine how much work B has done in a day. Then multiply this by 3 to get A's workload per day. Eventually, add them so you can do all the work in one day. Finally, find out the total time it took them to complete the work.
Let the total work be W.
Then, Speed of

and Speed of

So the time (days) they spent working together
Question Image

Hence, option 2 is correct.

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