One pump can fill a tank with oil in 10 hours. together with a second pump, it can fill the tank in 6 hours. how long will it take the second pump to fill the tank if it is used alone?

The second pump can fill a tank with oil in 15 hours.

Step-by-step explanation:

It is given that one pump can fill a tank with oil in 10 hours. Together with a second pump, it can fill the tank in 6 hours.

Let the second pump can fill a tank with oil in t hours.

One hour work of first pump is .

One hour work of second pump is .

One hour work of both pump together is .

1 hour work of both = 1 hour work of 1st pump + 1 hour work of 2nd pump

Cross multiply.

Subtract 6t from both the sides.

Divide both the sides by 4.

Therefore the second pump can fill a tank with oil in 15 hours.

b. 2 and 4

step-by-step explanation:

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