Two pipes P and Q can fill a cistern in
12 and 15 minutes respectively. Both are
opened together, but at the end of 3 minutes,
P is turned off. In how many more minutes
will Q fill the cistern ?
Two trains, 80 metres and 120 metres long,
are running at the speed of 25 km/hr and
35 km/hr respectively in the same direction
on parallel tracks. How many seconds will
they takes to pass each other ?
The simple interest on a sum of money is
of the principal and the number of years
is equal to the rate perecent per annum.
The rate of interest per annum is –
% (B) 2
(C) 3% (D) 3