**Question**

**Two persons starting from the same place walk at a rate of 5kmph and 5.5kmph respectively. What time will they take to be 8.5km apart, if they walk in the same direction?**

A. 11 hrs

B. 16 hrs

C. 19 hrs

D. 17 hrs

**Answer :** D

**Solution:**

The relative speed of the boys = 5.5kmph – 5kmph

= 0.5 kmph

Distance between them is 8.5 km

Time = 8.5km / 0.5 kmph

= 17 hrs