Question

Two cars are moving in the same direction with the same speed of 30km/hr. They are separated by 5km. What is the speed of car moving in the opposite direction if it meets the two cars at an interval of 4 minute:

Answer 1

Answer:

Let the speed of the car be x km/hr

Velocity of the car= -x km/hr

Speed of the cars moving in same direction = V=30 km/hr

Their distance= 5 km

Relative velocity of the back car with respect to the opposite car =$[V-(-x)]km/hr =(V+x)km/hr$

Time taken by the opposite car to pass the back car from the front car=4 min= (1/15)hr

$=>\frac{5}{V+x}=\frac{1}{15}\\ =>\frac{1}{V+x}=\frac{1}{75}\\ =>V+x=75\\ =>30+x=75\\ =>x=45\: km/hr\\ \\ \red{\bold{\therefore\: The\: speed\: of \: the\: car\: is\: 45\: km/hr}}$

Answer 2

Answer:

45km per hour

Explanation:

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