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 person bought 8 Kg. of rice for certain rupees.He sold 3 Kg at 10% profit,3 Kgs with neither profit nor loss and 2 Kgs at 5% loss. What is profit or loss in this transaction ?
Three men start together to travel the same way around a circular track of 11 Km.Their speeds are 4, 5.5 and 8 Km/hr. respectively. After what time will they meet at the starting pint for the first time ?