A pool has two pipes, one that pours water into the pool, and one that drains water from the pool. It takes 6 hours for a pipe to fill an empty pool with the other pipe closed. It takes 9 hours for a pipe to empty this pool when full (also with the other pipe closed). If the pool is empty and both pipes are open at the same time, how long will it take for the pool to fill? Select one answer
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
A pool has two pipes, one that pours water into the pool, and one that drains water from the pool. It takes 6 hours for a pipe to fill an empty pool with the other pipe closed. It takes 9 hours for a pipe to empty this pool when full (also with the other pipe closed). If the pool is empty and both pipes are open at the same time, how long will it take for the pool to fill? Select one answer
A 3 3/5 hours
B 7 1/2 hours
C 9 hours
D 13 1/2 hours
E 18 hours
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