Walking 9/8 of his usual rate, a boy reaches his school 4 min early. Find his usual time to reach the school? Choose the correct answer:	A) 22	B) 99	C) 27	D) 36	E) 20
Speed Ratio = 1:9/8 = 8:9   Time Ratio = 9:8   1 -------- 9   4 --------- ? 36 m.Answer:36
<result>D</result>
Walking 9/8 of his usual rate, a boy reaches his school 4 min early. Find his usual time to reach the school?