A Person X started at 3 hours earlier at 40km/h from a place P, then another person Y followed him at 60km/h started his journey at 3 O'clock, afternoon. What is the difference in time when X was 30 km ahead of Y and when Y was 30 km ahead of X?
Explanation:
Time (when X was 30 km ahead of Y) = (120 - 30)/20 = 4.5h
Time (when Y was 30 km ahead of X) = (120 + 30)/20 = 7.5 h
Thus, required difference in time = 3h
Hence, option (b).
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