Question

Sue left her home at 6 A.M. driving her car at the rate of 50 miles per hour. At 8 A.M. her brother Kevin drove after her along the same highway, traveling at the rate of 60 miles per hour, in how many hours did Kevin pass Sue.

Answer 1

It took Kevin 10 hours to pass Sue, given there was no stopping involved.

Sue had a 100 mile lead over Kevin, but Kevin's car goes 10 miles faster. 100/10 = 10, so 10 hours Ans.

Answer 2

50(2) + 50x = 60x
100 = 10x
10 = x
10 hrs