If earths rotational motion increases by 12% then the relation between a day and hours will be `12\ hou r s=1\ d a y` b. `20 5/7\ hou r s=1\ d a y` c. `21 3/7hou r s=1\ d a y` d. None of these

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

A vessel has three pipes connected to it two to supply liquid and one to draw liquid. The test alone can fill the vessel in 4 1/2 hours, the second in 3 hours and the third can empty it in 1 1/2 hours. It all the pipes are opened simultaneously when the vessel is hall full, how soon will it be emptied? 4 1/2hou r s b. 5 1/2 hou r s c. 6 1/2 hou r s d. none of these

If the d.r.'s of a line are (3, -4, 12) then d.c.'s of the line are

A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank? 20 hou r s b. 25 hou r s c. 35 hou r s d. cannot be determined e. none of these

If x + 3y - 7 = 0 is the relation between x and y and s.d. (y) = 7 then find the s.d.(x)

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

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

In covering a certain distance, the speeds of A and B are in the ratio of 3:4. A takes 30 minutes more than B to reach the destination. The time taken by A to reach the destination is 1 hou r b. 2 hou r s c. 1 1/2hou r s d. 2 1/2hou r s

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

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