Question
Pipe A can fill a tank in 6 hours, and Pipe B can fill
it in 8 hours. Pipe C can empty the tank in 10 hours. If all three pipes are opened simultaneously, how long will it take to fill the tank?Solution
Rate of Pipe A = 1/6, Rate of Pipe B = 1/8, Rate of Pipe C = -1/10 Net rate when all three are open = 1/6 + 1/8 - 1/10 Net rate = (40 + 30 - 24) / 240 = 46 / 240 = 23 / 120 Time to fill the tank = 1 / (Net rate) = 120 / 23 ≈ 5.22 hours Correct Option: b) 5.22 hours
The alarms of two alarm clocks sound at regular intervals of 72 seconds and 80 seconds. If they beep together for the first time at 6:00 am, at what tim...
What will come in the place of question mark (?) in the given expression?
?2 = 3945 ÷ 5 + 774 ÷ 6 – 77Â
(3984 ÷ 24) x (5862 ÷ 40) = ?
14% of 700 + 15% of 900 + 10% of 160 = ?
15 × 18 + 25 × 12 + 30 × 24 = ?% of 1720
1231 + 1312 + 2113 – 3211 = ?
3.2% of 500 × 2.4% of ? = 288
What will come in the place of question mark (?) in the given expression?
28 × 15 + 48% of ? = 780
What will come in the place of question mark (?) in the given expression?
1020 ÷ 51 × 5 + 540 of 25% - 10 = ?2Â
[{(3 × 54 × 21)/63} + 6] / 6 = √?Â
