At 9 a.m,a hiker was due south of point P. What direction was point P from her position at noon?
(1)From 9 a.m until 11 a.m she walked due east at 2 miles per hour, and from 11 a.m until noon, she walked due north at 3 miles per hours.
(2)At noon,she is exactly 4.5 miles from point P
答案选的是E,为什么不是C呢? |