A and B are 20 km apart. A can walk at an average speed of 4 km/hour and B at 6 km/ hr. If they start walking towards each other at 7 a.m., when they will meet ?
Distance between A & B = 20 km
Since they are walking towards each other, their relative speed will be the sum of their individual speeds
=> relative speed = 6+4 = 10 km/h
=> Time taken to meet each other = $$\frac{20}{10}$$ = 2 hours
=> They will meet at (7+2) = 9.00 a.m.
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