Two numbers are in the ratio 3: 5. If their L.C.M. is 75. what is the sum of the numbers?

A person employed a group of 20 men for a construction job. These 20 men working 8 hours a day can complete the job in 28 days. The work started on time but after 18 days, it was observed that two-thirds of the work was still pending. To avoid penalties and complete the work on time, the employer had to employ more men and also increase the working hours to 9 hours a day. Find the additional number of men employed if the efficiency of all men is the same.

Three pipes A, B, and C were opened to fill a tank. Working alone, A, B, and C require 10, 15, and 20 hours respectively. A was opened at 7 AM, B at 8 AM, and C at 9 AM. At what time the tank would be completely filled, given that pipe C can only work for 3 hours at a stretch, and needs 1-hour standing time to work again.

Rajdhani Express halts for 3 minutes every time it covers a distance of 75 km. If the train runs at a speed of 100 km/h and the destination is 600 km away from the source, find out the time taken to reach the destination station from the source station.

A train crosses a pole in 20 sec. If the length of the train is 500 meters, what is the speed of the train?

Mark, Steve, and Bill get their salaries in the ratio of 2:3:5. If their salaries are incremented by 15%, 10%, and 20% respectively, the new ratio of their salaries becomes:

The present ages of A, B, and C are in proportions 4:5:9. Nine years ago, sum of their ages was 45 years. Find their present ages in years

. Felix spends 66.66% of his salary and saves Rs 1200 every month. Calculate his monthly expenditure in Rupees.

Father is aged three times more than his son Ronit. After 8 years, he would be two and a half times of Ronit's age. After further 8 years, how many times would he be of Ronit's age?