Question: Two cars start from the same point and travel in the same direction at 50 km/h and 70 km/h. How long will it take for the faster car to be 40 km ahead?
(a) 1 hour
(b) 2 hours
(c) 3 hours
(d) 4 hours
Solution:
Relative speed:
70−50=20 km/h
Time required:
40/20 = 2 hours
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