GRAHAM WALKED TO SCHOOL AT AN AVERAGE SPEED OF 3 MILES AN HO

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GRAHAM WALKED TO SCHOOL AT AN AVERAGE SPEED OF 3 MILES AN HOUR AND JOGGED BACK ALONG THE SAME ROUTE AT 5 MILES AN HOUR.IF HIS TOTAL TRAVELLING TIME WAS 1 HOUR,what was the total number of miles in the round trip
A,3 B,3+1/8 C,3+3/4 D,4 E,5

答案是C设走去得时间是X 3x=5(1-x) 解出x 然后你就会了吧答案是C 祝所有备考Sat的人（当然包括我^_^）全都RP爆发加油!

GRAHAM WALKED TO SCHOOL AT AN AVERAGE SPEED OF 3 MILES AN HO 一道英文数学题,求解Becca runs at an average speed of 4 miles per hour Esther drove to work in the morning at an average speed of 4 Ali drove from Town A to Town B at an average speed of 60 km 英语翻译Esther drove to work in the morning at an average speed I often speed at 70 miles an hour如果把speed当名词用,那用at the speed 英语翻译1 speak at an average speed in rhythmic patterns2 respon This kind of car can run ___a speed of 80 miles an hour. A.a He drove the car__the speed of thirty miles an hour,which__t the winning car reached a speed of fourty miles an hour-much the winning car reached a speed of forty miles an hour much The winning car reached a speed of forty miles an hour--much