Advertisements
Advertisements
प्रश्न
Choose the most appropriate option
Taps ‘A’ and ‘B’ can fill a tank in `37 1/2` minutes and 45 minutes respectively. Both taps are opened and after some time tap ‘B’ is turned off. The tank is filled completely in exactly 30 minutes, if tap ‘B’ is turned off after:
पर्याय
12 minutes
15 minutes
9 minutes
10 minutes
Advertisements
उत्तर
9 minutes
Explanation:
By shortcut method,
Pipe B should be closed after`=(1-(30xx2) /75) xx 45`
`=15/75xx45`
= 9 minutes.
APPEARS IN
संबंधित प्रश्न
A train 600 meters long is running at a speed of 90 kms/hr. If it crosses a tunnel in one minute, then the length of the tunnel is:
A watch which gains uniformly is 2 minutes slow at noon on Monday and is 4 minutes 48 seconds fast at 2 p.m on the following Monday. When was it correct?
A boat takes 3 hours to travel from place M to N downstream and back from N to M upstream. If the speed of the boat in still water is 4 km/hr, what is the distance between the two places?
The Bubna dam has four inlets. Through the first three inlets, the dam can be filled in 12 minutes; through the second, the third and the fourth inlet, it can be filled in 15 minutes; and through the first and the first inlet, in 20 minutes. How much time will it take all the four inlets to fill up the dam?
A clock gains 5 minutes every hour. Then the angle traversed by the second's hand in one minute will be
There is a leak in the bottom of a tank. This leak can empty a full tank in 8 hours. When the tank is full, a tap is opened into the tank which admits 6 litres per hour and the tank is now emptied in 12 hours. What is the capacity of the tank?
In a flight of 600 km, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by 200 km/h and the time of flight increased by 30 min. The duration of the flight is
A man covers half of his journey as 6 km/h and the remaining half at 3 km/h. His average speed is
Sita and Geeta start at the same time to ride from place A to place B, which is 90 km away from place A. Sita travels 3 km per hour slower than Geeta. Geeta reaches place B and at once turns back, meeting Sita 15 km from place B. Geeta's speed (in km/h) is:
A motor starts with the speed of 70 kmph with its speed increasing every two hours by 19 kmph. In how many hours will it cover 345 kms?
