A man can do a piece of work in 5 days He and his son working together can finish it in 3 days In ho...

Question

A man can do a piece of work in 5 days He and his son working together can finish it in 3 days In how many days can the son do it alone a 6 days b 7 days c 7 days d 8 days

Accepted Answer

we know that Number of days man required to do a piece of work 5 days Number of days his son required to do a piece of work 3 days Let us consider the number of days both man and his son require x days We can calculate work done by man in 1 hour 15 Work is done by his son in 1 hour 1x Now work done by both man and his son together in a 1 hour 13 Now work is done by both man and his son together in 1 hour 15 1x x55x x55x 13 3x 15 5x 2x 15 x 152 x 7 Son alone can do work together in 6 days

RS Aggarwal Solutions Class 8 Mathematics Solutions for Time and Work Exercise 13B in Chapter 13 - Time and Work