Walking 6/7 of his usual rate, a boy reaches his school 4 min early. Find his usual time to reach the school?	Pick one:  A) 28 m  B) 20 m  C) 22 m  D) 23 m  E) 24 m
Speed Ratio = 1:6/7 = 7:6   Time Ratio = 6:4   1 -------- 6   4 --------- ?   =&gt; 24 m   ANSW24 mR:24 m
<result>E</result>
Walking 6/7 of his usual rate, a boy reaches his school 4 min early. Find his usual time to reach the school?