Question
Pipe ‘A’ can fill a tank in 22 hours while pipe
‘B’ takes 25 hours to empty it. Pipe ‘A’ is opened alone when the tank was empty and after 16 hours pipe ‘B’ is also opened. In how much time will the tank get filled completely?Solution
Let the total capacity of the tank be 550 units Efficiency of pipe ‘A’ = 550/22 = 25 units/hour Efficiency of pipe ‘B’ = 550/25 = 22 units/hour Tank filled in 16 hours = 16 × 25 = 400 units Therefore, required time taken to fill the remaining tank = (550 – 400)/(25 – 22) = 50 hours Therefore, total time taken = 16 + 50 = 66 hours
There are five students S, T, U, V and W participating in a match. T gets lesser score than only U and S. V scores lesser than T and more than W. S does...
David is ranked 15th from the top in his class. When counted from the bottom, he is ranked 126th. What is the total number of students in the class?
Who ranks fourth in the sequence in reaching the school?
Sunil ranks twenty - first in a class of 65 students. What will be his rank if the lowest student is assigned as rank 1?
Who lives on the same floors?
How many students scored more marks than V?
Six persons H, X, E, J, L and K stand in a queue according to their heights. Not more than two persons are shorter than K. L is taller than E, who is t...
Seven students Q, R, S, T, U, V and W are going for an entrance examination. Only two students score more marks than Q. T score more marks than U but le...
T is taller than V who is shorter than U. W is taller than X but shorter than V. U is shorter than T. Who is the tallest?
Five persons G, P, B, W and D have different weights. Only one person has more weight than D. P is heavier than W but not the heaviest. Weight of secon...
