Piu and Titu start from the same place at the same time and walk in opposite directions. If Piu walks at 5 km/h and Titu walks at 2 km/h, after what time will they be 10.5 km apart?
Time =Â $$\frac{distance\ covered}{relative\ speed}$$
= $$\frac{10.5}{5+2}$$
= $$\frac{10.5}{7}$$
= 1.5 hours
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