Question

Kasem can do a piece of work in 7.5 hours and Sunil
can finish it in 10 hours. If Kasem works at it for 3
hours and Sunil for 4 hours the amount of work left
unfinished is:
(a) 1/5
(b) 2/5
(c)1/4
(d) 2/7​

Answer 1

Answer:

(a)1/5

Step-by-step explanation:

Kasem can do a piece of work in 7.5 hours

Kasem=1/7.5 hrs

Sunil  can finish it in 10 hours.

Sunil=1/10 hrs

If Kasem works at it for 3

hours and Sunil for 4 hours the amount of work left

unfinished is:

3/7.5+4/10=4/5

remaining work is 1-4/5=1/5