It cost a college Rs.0.70 a copy to produce a Programme for
the homecoming football game. If Rs.15,000/- was received
for advertisements in the programme, how many copies at
Rs.0.50 a copy must be sold to make a profit of Rs.8000/- ?
A son and father goes for boating in river upstream . After
rowing for 1 mile son notices the hat of his father falling
in the river. After 5 min. he tells his father that his hat
has fallen. So they turn around and are able to pick the
hat at the point from where they began boating after 5 min.
Find out the speed of river.
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