Question

Two cars are moving in the same direction with the same speed 30 km/h. they are separated by a distance of 4km. What is the speed of the car moving in theopposite directions if it meets these two cars at an interval of 5 minutes?

Answer 1

Explanation:

This is a question related to relative motion, here is the answer :-

let the two cars moving in same direction be A and B and the third car be C.

let the velocity of C be 'u'.

so velocity of C with respect to B would be. u+30(as they are moving in opposite directions).

do the speed u+30 would be given by

5/(4÷60) = u+30

5×60/4= u+30

75 = u+30

hence u = 45 kmph

Answer 2

Answer:

Since the two cars are moving in the same direction with same speed therefore relative speed between two cars is zero.

Let the relative speed of the third car be w.r.t the two cars.

Relative velocity of the third car:  

(4/60)h

5km

​  

=75km/h

Actual velocity of the third car:75−30=45km/h

Explanation: