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Start learning 50% faster. Sign in nowLet the speed of the boy in still water be x kmph. Then, (x + 4) × 2 = (x – 4) × 3 => 2x + 8 = 3x - 12 => x = 20 kmph
Pipe ‘A’ can fill a tank in 30 hours while pipe ‘B’ can empty it in 40 hours. They were operated on alternate hours starting with pipe ‘A’. ...
A tank is filled by three pipes A, B, and C. Pipe A can fill the tank in 12 hours, pipe B in 16 hours, and pipe C can empty the tank in 8 hours. If all ...
Pipes 'A' and 'B' have the capacity to fill a tank in 12 hours and 15 hours, respectively. Conversely, pipe 'C' can drain the same tank in 20 hours. Ini...
In how many minutes can the faster Tap alone fill the tank, if Tap P and Q, working together, can fill the tank in 45 minutes and Tap P is three times f...
Pipe ‘A’ and pipe ‘B’, together can fill 20% of a tank in 7 hours while pipe ‘C’ takes 40 hours to empty it. ...
Two pipes A and B are opened together to fill a tank. Both the pipes fill the tank in time “x”. If A separately takes 8 minute more time than “x�...
Pipe ‘A’ can fill a tank in 20 hours while pipe ‘B’ takes 30 hours to empty it. Pipe ‘A’ is opened alone when the tank was empty and after 1...
Tap A can fill a tank in 10 hours. Tap B can fill 25% part of the same tank in 3 hours, whereas Tap C can alone empty a tank in ‘x’ hours. 2/5 part ...
Pipe ‘X’ and pipe ‘Y’ together can fill an empty tank in 24 hours while pipe ‘Y’ and pipe ‘Z’ together take 15 hours to fill the same ta...
