NIACL Model Paper 3 with solutions for free online practice

One day's work of P and Q together =

7

72

i.e.

1

P

+

1

Q

=

7

72

- (i)
and one day's work of Q and R together =

3

40

i.e.

1

Q

+

1

R

=

3

40

- (ii)
But time taken by R = 1.25 × time taken by Q i.e.

1

Q

+

1

R

=

1.25

R

+

1

R

=

2.25

R

- (iii)
Solving eq. (i), (ii) and (iii)
we get,
Time taken by P to complete the
whole work alone = 18 days
And that by Q = 24 days and
by R= 30 days
Req. answer =

(18×30)

48

= 11

1

4

days