Walking 7/6 of his usual rate, a boy reaches his school 6 min early. Find his usual time to reach the school?
Select the correct option
A) 22
B) 28
C) 99
D) 42
E) 66
Speed Ratio = 1:7/6 = 6:7   Time Ratio = 7:6   1 -------- 7   6 --------- ?   =42 m   Answer:42
<result>D</result>
Walking 7/6 of his usual rate, a boy reaches his school 6 min early. Find his usual time to reach the school?