Four gardeners with four grass mowers mow 400 sq. m of ground in 4 hours. How long would it take for eight gardeners with eight grass mowers to mow 800 sq. m of ground? `4\ hou r s` b. `6\ hou r s` c. `8\ hou r s` d. `12\ hou r s`

A can do a piece of work in 4 hours, B and C together in 3 hours, and A and C together in 2 hours. How long will B alone take to do it? 8 hou r s b. 10 hou r s c. 12 hou r s d. 24 hou r s

An outlet pipe can empty a cistern in 3 hours. In what time will the empty 2/3 part of the cistern? 3 hou r s b. 5 hou r s c. 2 hou r s d. 4 hou r s

A cistern has two pipes. One can till it with water in 8 hours and other can empty it in 5 hours. In how many hours will the cistern be emptied if both the pipes are opened together when 3/4 of the cistern is already full of water? 3 1/3hou r s b. 6 hou r s c. 10 hou r s d. 13 1/3hou r s

5 persons can prepare an admission list in 8 days working 7 hours a day. If 2 persons join them so as to complete the work in 4 days, they need to work per day for 8 hou r s b. 9 hou r s c. 10 hou r s d. 12 hou r s

A car takes 15 minutes less to cover a distance of 75 km, if it increases its speed by10 km/hr from its usual speed. How much time would it take to cover a distance of 300 km using this speed? 5 hou r s b. 5 1/2hou r s c. 6 hou r s d. 8 6 1/2 hours

A car covers a distanced of 432 km at the speed of 48 km/hr. In how many hours will the car cover this distance? 6 hou r s b. 7 hou r s c. 9 hou r s d. 12 hou r s e. none of these

Car is driven at the speed of 100 km/hr and stops for 10 minutes t the end of every 150 km. to cover a distance of 1000 km, it will take 9 hou r s b. 10 hou r s c. 11 hou r s d. 12 hou r s

A bus left X for point Y. Two hours later a car left point X for Y and arrived at Y at the same time as the bus. If the car and the bus left simultaneously from the opposite ends X and Y towards each other, they would meet 1 1/3 hours after the start. How much time did it take the bus to travel form X to Y? 2 hou r s b. 4 hou r s c. 6 hou r s d. 8 hou r s

A takes 2 hours more than B to walk d km, but /it A doubles his speed, then he can make it in 1 hour less than B. How much time does B require for walking d k m ? d/2 hou r s b. 3 hou r s c. 4 hou r s d. (2d)/3hou r s

Reena, Aastha and Shloka can independently complete a piece of work in 6 hours, 4 hours and 12 hours respectively. If they work together, how much time will they take to complete that piece of work? 2 hou r s b. 5 hou r s c. 6 hou r s d. hou r s e. none of these