tailieunhanh - grubers complete sat guide 2009 phần 3

Tham khảo tài liệu 'grubers complete sat guide 2009 phần 3', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 198 COMPLETE SAT MATH REFRESHER Practice Test 2 Rate Problems Distance and Time Work Mixture and Cost Correct answers and solutions follow each test. 1- A I i I I I I I I B I I I I I I I I I I C D E 1. A man rowed 3 miles upstream in 90 minutes. If the river flowed with a current of 2 miles per hour how long did the man s return trip take A 20 minutes B 30 minutes C 45 minutes D 60 minutes E 80 minutes C D E 2. A I I I I I I I I I I B I I I I I I I I I I 2. Charles can do a job in 1 hour Bill can do the same job in 2 hours and Bob can do the job in 3 hours. How long does it take them to do the job working together 6 A hours B 1 hour C 6 hours D -1 hours E 1 hours A B C D E 3. II II II II II II II II II II II II II II II II II II II II II II II II II 3. Mr. Smith had 2 000 to invest. He invested part of it at 5 per year and the remainder at 4 per year. After one year his investment grew to 2 095. How much of the original investment was at the 5 rate A 500 B 750 C 1 000 D 1 250 E 1 500 A B C D E 4. II II II II II II II II II II II II II II II II II II II II II II II II II 4. A man walks down the road for half an hour at an average speed of 3 miles per hour. He waits 10 minutes for a bus which brings him back to his starting point at 3 15. If the man began his walk at 2 25 the same afternoon what was the average speed of the bus A miles per hour B 3 miles per hour C miles per hour D 6 miles per hour E 9 miles per hour e A B C D E 5. II II II II II II II II II II II II II II II II II II II II II II II II II 5. Faucet A lets water flow into a 5-gallon tub at a rate of gallons per minute. Faucet B lets water flow into the same tub at a rate of gallons per minute. Faucet A runs alone for 100 seconds then the two of them together finish filling up the tub. How long does the whole operation take A 120 seconds B 150 seconds C 160 seconds D 180 seconds E 190 seconds COMPLETE SAT MATH REFRESHER 199 6. A I I B C D E 6. Coffee A normally costs 75d per pound. It .