Two men P and Q start a journey from the same place at a speed of 3 km/hr and 31/2 km/hr respectively. If they move in the same direction then what is the distance them after 4 hours ?

Answer: Option C

Distance between the speed of P and Q
= $$3\frac{1}{2}$$ - 3
= $$\frac{7}{2}$$ - 3
= $$\frac{1}{2}$$ km/hr
So,
Distance = Speed × Time
. Time = 4 hours
⇒ Distance = $$\frac{1}{2}$$ × 4
⇒ Distance = 2 km