a) 4 km/h
b) 6 km/h
c) 7 km/h
d) 5 km/h
Answer: d
Explanation: P__________3.5Km__________M__1km____Q
Speed of A = 1 km in 18 min = $$\frac{{1000}}{{18}}$$ = 55.55 m/min.
When A travels 3.5 km. B already has been traveled (4.5 + 1) = 5.5 km
A will take time to travel 3.5 km = $$\frac{{3500}}{{55.55}}$$ = 63 min.
So, B will take 66 min to travel 5.5 km (As B has started 3 min before of A)
Speed of B = $$\frac{{5500}}{{66}}$$ = 83.33 m/min = 5 km/h
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