a) 2 hr
b) $$2\frac{1}{2}$$ hr
c) 3 hr
d) 1 hr
Answer: a
Explanation:
$$\eqalign{
& {\text{Relative speed}} = 60 + 50 \cr
& {\text{ = 110 km/h}} \cr
& {\text{Time taken}} \cr
& {\text{ = }}\frac{{220}}{{110}} \cr
& {\text{ = 2 hr}} \cr} $$
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