单项选择题

Two aeroplanes are flying straight towards each other. One is traveling at 10 kilometres per minute, and the other at 15 kilometres per minute. Assuming that the planes are exactly 1,000 kilometres apart, what distance will be between them one minute before they crash into each other

A. 10 kilometres
B.15 kilometres.
C.25 kilometres.
D. 5 kilometres.
热门 试题

填空题
registered
填空题
electronic database