An escalator is descending at constant speed . A walks down and takes 50 steps to reach the bottom. B runs down and takes 90 steps in the same time as A takes 10 steps. How many steps are visible when the escalator is not operating?
Jack, Dough and Ann, 3 children had a race when returnung from school. Ann takes 28 steps when dough takes 34 steps , meantime Jack takes 21 steps. Jack explained that his 6 steps equals dough's 7 steps and Ann's 8 steps . Who won the race?
There is a escalator and 12 persons move down it. A takes 50 steps and B takes 75 steps while the escalator is moving down.Given that the time taken by A to take 1 step is equal to time taken by B to take 3 steps. Find the no.of steps in the escalator while it is stationary
Everyday a cyclist meets a car at the station. The road is straight and both are traveling in the same direction. The cyclist travels with speed of 12mph. One day the cyclist comes late by 20 min. and meets the car 5 miles before the station. What is the speed of the car?
A car travellinf at a uniform speed. The driver sees a milestone showing 2-digit number.After traveling for an hour the driver sees another milestone with same digits in reverse order. After another hour the driver sees another milestone containing the same 2 digits. What is the average speed of...
express (2^1/2-1)^10 in the form k^1/2-(k-1)^1/2 where k is a positive integer.{the square roots need not be irrational}we can do this by binomial theorem but it is very tedious.is there a short & appropriate method to solve this problem?