Question

P and q start simultaneously from two different places towards each other with speed of 20 km/h and 30 km/h. by the time they meet q has travelled 36 km more than p. what is the distance between them

Answer 1

Speed of P = 20 km/hr
Speed of Q = 30 km/hr
Q covers 10 km more than P in 1 hour
So 36 km covered in x hours
36== x*10
x = 36/10 = 3.6 hours
Distance between them = Total distance covered by them in 3.6 hours
D = S * T
S = Relative speed = 20 + 30 = 50 km/hr 
D = 3.6*50 = 180 km
Distance between them is 180 km
Hope it helps.