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:
विकल्प
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 car driver increases the average speed of his car by 3 km/hr every hour. The total distance travelled in 7 hours if the distance covered in the first hour was 30 km, is
Solve the following question and mark the best possible option.
Two athletes A and B are running on a 900m long track from opposite ends, their speeds are in the ratio of 4: 5, when will they cross each other:
Two taps ‘A’ and ‘B’ can fill a water reservoir in 8 and 6 hours respectively. A third tap ‘C’ can empty the tank completely in 24 hours. How long would it take to fill the empty tank when all the taps are open?
A train running at the rate of 40 km/h passes a man riding parallel to the railway line in the same direction at 25 km/h in 48 seconds. Find the length of the train in metres.
Anju is waiting on the railway station for the arrival of her train. Two trains running in opposite directions cross Anju on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speed is
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
Robert is travelling on his cycle and has calculated to reach point A at 2 pm if he travels at 10 km/h, he will reach there at 12 noon if he travels at 15 km/h. At what speed must he travel to reach A at 1 pm?
Two trains of equal length are running on parallel lines in the same direction at 46 km/h and 36 km/h. The faster train passes the slower train in 36 s. The length of each train is
A man crosses a road 250 metres wide in 75 seconds. His speed in km/hr is :
The length of a train and a platform is equal. The train at the speed of 90 km/hr crosses the platform in 1 minute. What is the length of platform?
