If , what is the value of in terms of ?

An electric pump can fill a tank in 3 hours. Because of a leak in the tank it is taking 3.5 hours
to fill the tank. How many hours will it take for the leak can drain all the water of the tank when it is
full?

1. 19
2. 20
3. 21
4. 22
5. 23

A policeman chases after a thief who has a 500m head start. They run at constant speeds, with the policeman running 1 km every 6 minutes and the thief 1 km every 10 minutes. How long will policeman take to catch up with the thief?

1. minutes
2. minutes
3. 10 minutes
4. 15 minutes
5. minutes

There are four different pairs of shoes in a drawer. If two shoes are selected from these at random, what is the probability that the two selected will be a matching pair?

?

1. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
2. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient
3. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
4. EACH statement ALONE is sufficient
5. Statements (1) and (2) TOGETHER are NOT sufficient

Is an integer?

1. is an integer
2. is an integer

1. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
2. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient
3. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
4. EACH statement ALONE is sufficient
5. Statements (1) and (2) TOGETHER are NOT sufficient