The shadow of a tower standing on a level plane to be 50 m longer when the sun 's altitude is 30 degree than when it is 60 degree.find the height of the tower.
(a)25m
(b)25 sqrt(3)m
(c) 23/sqrt(3)m
(d) 30m
A wall measures 40m by 30m contains a window of size 15m by 10m. If the wall is hit by four stones, assuming that each stone hits the wall in a random position, independently of other stones, what is the probability that every throw hits the window ?
A & B alone can do a piece of work in 12 and 16 days respectively. They work for 8days alternately and remaining work is done by C in 5 days.
In how many days C alone can do the work.