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 tripA,3 B,3+1/8 C,3+3/4 D,4 E,5

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/06 14:25:14

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!