Three pipes, A, B, & C are attached to a tank. A & B can fill it in 20 & 30 minutes respectively while C can empty it in 15 minutes. If A, B & C are kept open successively for 1 minute each, how soon will the tank be filled?

rahul

• Dec 8th, 2017

A and B can fill the tank as 1/20+1/30=5/60 for 2 mins C an empty it as -1/15 i.e, -4/60in 1 min Now together they will fill 5/60-4/60=1/60 for 3 mins So at the end of 55th successive (to match wit...

Ratan

• Sep 4th, 2017

Why should we add those units?

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A family, planning a weekend trip, decides to spend not more than a total of 8 hours driving. By leaving early in the morning, they can average 40 miles per hour on the way to their destination. Due to the heavy Sunday traffic, they can average only 30 miles per hour on the return trip. What is the farthest distance from home they can plan to go?

atul

• Aug 7th, 2011

137.5mile

saritha1406

 Profile Answers by saritha1406 Questions by saritha1406

• Oct 13th, 2010

Here 1 km = 0.625 miles (approximately)40 miles = 40 * 1/0.625 kms/hr = 64 kms/hr30 miles = 30 * 1/0.625 kms/hr = 48 kms/hrh= time taken to travel destinationDistance travelled till destination = 64 *...

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