Question

Ex.1. A and B are 20 km apart. A can walk at an aver- age 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 ? (1) 8.00 a.m. (2) 8.30 a.m. (3) 9.00 a.m. (4) 10.00 a.m.

11th - 12th Class

Maths

Solution

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Sol. (3) If A and B meet after t hours, then ( 4 t+6 t=20 Rightarrow 10 t=20 ) ( Rightarrow t=frac{20}{10}=2 ) hours Hence, both will meet at 9 a.m.