Walking 7/6 of his usual rate, a boy reaches his school 4 min early. Find his usual time to reach the school?
Choose the correct choice from the following answers
A) 22	B) 21	C) 22	D) 28	E) 11
Speed Ratio = 1:7/6 = 6:7   Time Ratio = 7:6   1 -------- 7   4 --------- ? è 28 m.Answer: 28
<result>D</result>
Walking 7/6 of his usual rate, a boy reaches his school 4 min early. Find his usual time to reach the school?