Answers

2015-01-29T23:06:24+05:30
Let speed of car A= x km/hr,
speed of car B=y km/hr
CASE 1
two cars travel in the same direction.
relative speed v=x-y km/hr 
distance d=100 km, they meet after 5 hrs. therefore t=5 hrs
t×s=distance 
5×(x-y)=100⇒ x-y=20.............(1)
CASE 2 
two cars travel in the opposite direction
relative speed v=x+y km/hr, d=100 km, they met after 1 hr therefore t=1 hr
t×s=distance⇒1×(x+y)=100⇒x+y=100...............(2)
solving (1) and (2) we get 
x=60km/hr y=40 km/hr
1 5 1