If `4/9t h` of a bucket is filled in 1 minute, the rest of it will be filled in a. `1` min b. `9/4` min c. `5/4` min d. `4/5` min

If 75% of a frist-order reaction is completed in 32 min, than 50% of the reaction would complete in? a. 24 min b. 16 min c. 8 min d. 4 min

A radioactive isotope decays at such a rate that after 96 min, only 1//8th of the original amount remains. The value of t_(1//2) of this nuclide is a. 12 min b. 32 min c. 24 min d. 48 min

In 1 minute (3)/(7) of a bucket is filled.The rest of the bucket can be filled in (7)/(3)m in utes b.(4)/(3)m in utes c.(7)/(4)m in utes d.none of these

Find the ratio of 4 min: 45 sec

A man wishes to cross a river perpendicularly. In still water he takes 4 minutes to cross the river, but in flowing river he takes 5 minutes. If the river 100 metres wide, the velocity of the flowing water of the river is a. 10m/min. b. 15m/min. c. 20m/min. d. 30m/min.

Two taps can fill a tank in 12 and 18 minutes respectively. Both are kept open for 2 minutes and the first is turned off. In how many minutes more will the tank be filled ? A)15 min B)20 min C)11 min D)13 min

Two pipes. A and B. can fill a tank in X minutes and 6 minutes, respectively. If both the pipes are used together, then they take 1.5 minute To fill the tank. Find the value of X. (a)1 min (b)4 min (c)5 min (d)2 min

A cylindrical vessel of radius 0.5 m is filled with oil at the rate of 0.25 m3/minute. The rate at which the surface of the oil is rising, is (a) 1 m/min. (b) 2 m/min. (c) 5 m/min. (d) 1.25 m/min.

It takes 15 min to completely fill an oil tank. However the oil tank is being used via an outlet in the tank which can empty it in 30 min. If this outlet is open, how much time will it take to fill the tank completely? (A) 20 min (B) 25 min (C ) 30 min (D) 40 min

A tap can fill a tank in 50 minutes. If the tank has a leakage which alone is capable of emptying the tank in 2^(1//2) hours, the tank will now be filled in __________ A. 1 hour B. 1 hour 15 mins C. 1 hour 25 mins D. 1 hour 30 mins