Karen is paddling her canoe up a river against the current. On a still pond, Karen can paddle 10 miles per hour. The river flows in the opposite direction at 4 miles per hour. If the river is 12 miles long, how many hours will it take Karen to paddle up it? Give the rationale and then the answer.
Let's think step by step. First find Karen's net speed by subtracting the speed of the current: 10 mph - 4 mph = 6 mph. Then divide the length of the river by Karen's speed to find how long it takes her to paddle up it: 12 miles / 6 mph = 2 hours.. The answer is: 2.

Daniel practices basketball for 15 minutes each day during the school week. He practices twice as long each day on the weekend. How many minutes does he practice during a whole week? Give the rationale and then the answer.
Let's think step by step. Daniel practices for a total of 15 x 5 = 75 minutes during the school week. He practices 15 x 2 = 30 minutes each day on the weekend. So, he practices a total of 30 x 2 = 60 minutes on the weekend. Thus, Daniel practices for a total of 75 + 60 = 135 minutes during a whole week.. The answer is: 135.

A clerk can process 25 forms per hour. If 2400 forms must be processed in an 8-hour day, how many clerks must you hire for that day? Give the rationale and then the answer.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think step by step. One clerk can process 25 x 8 = 200 forms in a day. To process the forms for that day 2400 / 200 = 12 clerks must be hired.. The answer is: 12.