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At 12:10 o’clock Bill leaves point A towards point B at a speed of 30 Km/h. At 13:40 o’clock Richi leaves from the same point towards point B also, but at a speed of 60 Km/h. At what time will Richi passes over Bill?
A. 14:40.
B. 15:10.
C. 16:10.
D. 15:40.
E. 15:30.
Correct Answer: B
Explanation/Reference:
Explanation:
At 13:40, Bill has already moved (30 x 1.5) 45 Km.
Their relative speed is (60 30) 30 Km/h; therefore it would take (45 / 30) 1.5 hours to close the gap between the two. 13:40 + 90 minutes are 15:10.
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