Question

Two points are there, two persons from A running to same direction with speed $20$ km/hr and $15$ km/hr respectively. From other end another person running to opposite direction with $30$ km/hr and distance between them $100$ km. At what time they will meet ?

Answer 1

Let Persons from point A be $P_{A1},P_{A2}$ and from point B be $P_B$

Now, $P_{A1}$ and $P_B$ will meet at Time $T_1$

$\Rightarrow 100=30T_1+20T_1$

$\Rightarrow T_1=2hrs$

Now, $P_{A2}$ and $P_B$ will meet at Time $T_2$

$\Rightarrow 100=30T_2+15T_2$

$\Rightarrow T_2=\frac{100}{45}hrs$