SOLUTION: Two pipes p1 & p2 can fill a tank in 40 minutes and 60 minutes respectively.Both the taps are opened and after 10 minutes p1 was shut. In how much more time would the tank be full?

Question 825010: Two pipes p1 & p2 can fill a tank in 40 minutes and 60 minutes respectively.Both the taps are opened and after 10 minutes p1 was shut. In how much more time would the tank be full?
A)30 minutes B)35 minutes
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
Both pipes were used for 10 hours, and only pipe 2 was used for some unknown amount of time afterward. The amount of tank filled was 1. Let x = time in hours after the first 10 minutess.

First period: p1 and p2 together for 10 minutes.
Second period: p2 for x minutes.
Total Time: 1 tank.

Use the rate information as tanks per time.
p1 rate is 1/40 tanks per minute.
p2 rate is 1/60 tanks per minute
p1 and p2 together rate is tanks per minute.

You have from the key uniform rate idea, R*t=j meaning rate time time equals the amount of job. Specific to our example, .
SOLVE FOR x.
RELATED QUESTIONS
Two taps can fill a tank in 12 minutes and 15 minutes respectively. Third tap can empty... (answered by ankor@dixie-net.com)

A and B are two taps which can fill a tank individually in 10 minutes and 20 minutes... (answered by josgarithmetic)

Pipe A can fill a tank in 24 minutes and pipe B can fill the tank in 32 minutes. Both... (answered by ankor@dixie-net.com)

Two taps can each fill a tank in 10 and 15 minutes respectively. Both were opened... (answered by AnlytcPhil)

A tank has three fill pipes and one drain pipe that are all controlled by levers located... (answered by Alan3354)

tank has three fill pipes and one drain pipe that are all controlled by levers located on (answered by ankor@dixie-net.com)

There are two taps X and Y. Tap X when opened alone takes 6minutes to fill a tank while... (answered by ptaylor)

two taps can fill a tank in 15 and 12 minutes respectively.a third tap can empty it in... (answered by josmiceli,ankor@dixie-net.com)

two pipes p and q can fill a tank 12 and 15 minutes respectfully. if both are opened... (answered by ankor@dixie-net.com)