Walking 7/6 of his usual rate, a boy reaches his school 2 min early. Find his usual time to reach the school? Choose the correct choice from the following answers.
A) 14	B) 28	C) 99	D) 77	E) 66

Rationale: "speed ratio = 1 : 7 / 6 = 6 : 7 time ratio = 7 : 6 1 - - - - - - - - 7 2 - - - - - - - - - ? 14 m answer : a"
Answer: A