CEMC Pascal, 2007

Geometry Difficulty 3.0 AMC 10/12 Find the answer Canada

Asafa ran at a speed of $21$ km/h from $P$ to $Q$ to $R$ to $S$ , as shown. Florence ran at a constant speed from $P$ directly to $R$ and then to $S$ . They left $P$ at the same time and arrived at $S$ at the same time. How many minutes after Florence did Asafa arrive at point $R$ ?

(A) $0$ (B) $8$ (C) $6$ (D) $7$ (E) $5$

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