An ambulance travels 10 miles at a speed of 75 miles per hour. How fast must the ambulance travel on the return trip if the round-trip travel time is to be 20 minutes?
A. 50 mph
B. 55 mph
C. 60 mph
D. 65 mph
E. none of these
Explanation: 75 mph বেগে 10 miles যেতে সময় লাগে \(\frac{10 \text{ miles}}{75 \text{ mph}} \times 60 \text{ min/hr} = 8\) মিনিট। return trip এ বাকি \((20-8) = 12\) মিনিটে 10 miles যেতে হলে গতিবেগ হবে = \(\frac{10 \text{ miles}}{12 \text{ min}} \times 60 \text{ min/hr} = 50\) mph.
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