Question #23502

1 Answer
yumean1119
Nov 21, 2017

For #10# seconds.

Explanation:

The relationship between distance(#d#), speed(#v#) and time (#t#) is #d=vt#.
Therefore, #t=d/v# is the formula you should use in the question.

Since #9.1# km#=9100# m, the time required to finish for driver 1 is #t_1=9100/65 = 140# (s). Driver 2 finishes in #t_2=9100/70=130# (s).

Driver 2 have to wait #t_1-t_2=140-130=10# seconds.

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