Somari sweeps 600 m long railway platform in `2 1/2` hours. His wife Imarati sweeps `2/3\ r d` of the same platform in `1 1/2\ hou r sdot` Who sweeps more speedily?

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

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

The length of a train and that of a platform are equal . If with the speed of 54 km/hr , the train crosses the platform in 1 (1)/(2) minutes , then what is the length of the platform in metres?

A man stands on a rotating platform with his arms stretched holding a 5 kg weight in each hand. The angular speed of the platform is 1.2 rev s^-1 . The moment of inertia of the man together with the platform may be taken to be constant and equal to 6 kg m^2 . If the man brings his arms close to his chest with the distance n each weight from the axis changing from 100 cm to 20 cm . The new angular speed of the platform is.

A man stands on a rotating platform with his arms stretched holding a 5 kg weight in each hand. The angular speed of the platform is 1.2 rev s^-1 . The moment of inertia of the man together with the platform may be taken to be constant and equal to 6 kg m^2 . If the man brings his arms close to his chest with the distance n each weight from the axis changing from 100 cm to 20 cm . The new angular speed of the platform is.

A point p moves in counter - clockwise direction on a circular path as shown in the figure . The movement of 'p' is such that it sweeps out in the figure . The movement of 'p' is such that it sweeps out a length s = t^(3) + 5 , where s is in metres and t is in seconds . The radius of the path is 20 m . The acceleration of 'P' when t = 2 s is nearly .

A point p moves in counter - clockwise direction on a circular path as shown in the figure . The movement of 'p' is such that it sweeps out in the figure . The movement of 'p' is such that it sweeps out a length s = t^(3) + 5 , where s is in metres and t is in seconds . The radius of the path is 20 m . The acceleration of 'P' when t = 2 s is nearly .

A point p moves in counter - clockwise direction on a circular path as shown in the figure . The movement of 'p' is such that it sweeps out in the figure . The movement of 'p' is such that it sweeps out a length s = t^(3) + 5 , where s is in metres and t is in seconds . The radius of the path is 20 m . The acceleration of 'P' when t = 2 s is nearly .

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

X takes 3 hours more than Y to walk 30km. But, if X double his pace, he is ahead of Y by 1 1/2hou r s . Find their speed of walking.