ATQ, Total age of 25 students = 25 × 15 years = 375 years. New average age after 5 students leave = 14 years. Total age of 20 students = 20 × 14 years = 280 years. Total age of the 5 students who left = 375 − 280 years = 95 years. Average age of the 5 students who left = 95/5 years = 19 years.
A train covers a certain distance at a speed of 48 km/h and the next same distance with a speed of 60 km/h and the next same distance with a speed of 80...
A policeman saw a thief from a distance of 450 m. When the policeman started chasing him, the thief also started running. The ratio of speeds of the th...
A Policeman spotted a thief 30 meters ahead of him. The moment they both saw each other they started running in the same direction on the same track. Th...
A train crosses a pole in 12 sec, and a bridge of length 170 m in 36 sec. Then the speed of the train is:
How much time a train 200 metres long running at the speed of 72 km/hr take to cross a bridge 180 metres in length?
The speed of a train is 72 km/hr and it takes 12 seconds to cross a man. Find the time taken by train to cross a platform if the ratio of the length of ...
X started to run from point ‘A’ to ‘B’ at a speed of 28 km/hr at 9:00 am and Y started to run from point ‘B’ to ‘A’ at a speed of 12 km/...
Walking at 3/ 4 of his usual speed, a man is 1 1/ 2 hr late. His usual time to cover the same distance (in hours) is?
Krishna covers a certain distance by train at 25 km/hr. and the equal distance on foot at 4 km/hr. If the time taken by him for the whole journey be 5 ...
In a 500 meter marathon, if Akhil beats Suraj by 160 meters and Suraj beats Puneet by 250 meters, then find the distance by which Akhil beats ‘C’.
