# How long will it take Mark to complete this task, at minimum?

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posted Dec 7, 2021
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Rohit and Virat, working together, can complete an assigned task in 20 days.
If Rohit worked alone and completes half the task and then Virat takes over and completes the remaining half, then the task gets completed in 45 days.
How long will Rohit take to complete the task is he worked alone?
Assume that Rohit is more efficient then Virat.

A man is allocated a task. He doubles the task done everyday. If the man completely does the task in 18 days, how many days did it take for the man to complete 25% of the task?

There is a huge water tank and there are four pipes that can fill the water tank.

The first pipe can fill the water tank completely in exact 2 days.
The first pipe can fill the water tank completely in exact 3 days.
The first pipe can fill the water tank completely in exact 4 days.
The first pipe can fill the water tank completely in exact 6 hours

Let's say we opened all the pipes simultaneously, how long will it take the water tank to be filled completely?

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You want to fill a bathtub by running water from both the hot and cold taps. The hot tap takes 6 minutes to fill the tub alone and the cold tap takes 4 minutes to fill alone. So you turn them both on at the same time but you are unaware that you left the plug out. The plug empties the tub in 12 minutes.

How long will it take to fill the tub?