Question

Rajesh can finish a job alone in seven and half hours and Manish can finish the same work alone in 5 hours if they work together in how much time can they finish the work​

Answer 1

Answer:

3 hours

Step-by-step explanation:

Rajesh can finish in 7.5 hrs

So work done in 1 hour is 2/15

Manish can finish in 5 hrs

So work done in 1 hour is 3/15

Work done together in an hour  is 2+3/15 = 5/15 = 1/3

So work will be done in 3hrs

Answer 2

Step-by-step explanation:

Rajesh can finish work in 7.5hrs

So work done in an hour = 1/15/2 = 1×2/15 = 2/15

Manish can finish work in 5hrs

So work in an hour =2/15+1/5 = 5/15 =1/3

So work done by together is 3hrs