A 60 kg man runs up a staircase in 12 seconds while 50 kg man runs up the same staircase in 11, seconds, the ratio of the rate of doing their work is

A man M_(1) of mass 80 kg runs up a staircase in 15 s . Another man M_(2) also of mass 80 kg runs up the same staircase in 20 s . The ratio of the power development by then will be:

A man M_(1) of mass 80 kg runs up a staircase in 15 s . Another man M_(2) also of mass 80 kg runs up the same staircase in 20 s . The ratio of the power development by then will be:

A man M_(1) of mass 80 kg runs up a staircase in 15 s. Another man M_(2) also of mass 80 kg runs up the stair case in 20 s. The ratio of the power developed by them will be:

A boy ''A'' of mass 50kg climbs up a stair case in 10s. Another boy ''B'' of mass 60kg climbs up a same staircase in 15s. The ratio of their power developed by the boys ''A'' and ''B'' is

A man of mass 50 kg ascends 30 steps of a staircase in 15 seconds. If the height of each step of the staircase is 20 cm, find the power of the man (g=9.8 m//s^(2)).

Two men with weights in the ratio 4:3 run up a staircase in time in the ratio 12:11. The ratio of power of the first to that of second is

Two men with weights in the ratio 4:3 run up a staircase in time in the ratio 12:11. The ratio of power of the first to that of second is

Two men with weights in the ratio 4:3 run up a staircase in time in the ratio 12:11. The ratio of power of the first to that of second is