# Pipes cisterns, Work time Sample Question

The given question is a work time question and tests your ability to relate to the relation between the number of days it takes two people to do a task to their efficiency of completing the task.

#### Question 1

Ram completes 60% of a task in 15 days and then takes the help of Rahim and Rachel. Rahim is 50% as efficient as Ram is and Rachel is 50% as efficient as Rahim is. In how many more days will they complete the work?

- None of these

Correct choice is

**(3)**. Correct Answer is

#### Explanatory Answer

Ram completes 60% of the task in 15 days.

i.e., he completes 4% of the task in a day.

Rahim is 50% as efficient as Ram is.

Therefore, Rahim will complete 2% of the task in a day.

Rachel is 50% as efficient as Rahim is

Therefore, Rachel will complete 1% of the task in a day.

Together, Ram, Rahim and Rachel will complete 4 + 2 + 1 = 7% of the work in a day.

They have another 40% of the task to be completed.

Therefore, they will take

more days to complete the task.