Question
Question: Two cars are moving in the same direction with a speed of 30 km/h. They are separated from each othe...
Two cars are moving in the same direction with a speed of 30 km/h. They are separated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 minutes. What is the speed of the third car
A
30 km/h
B
35 km/h
C
40 km/h
D
45 km/h
Answer
45 km/h
Explanation
Solution
Let v be the velocity of third car, then relative velocity of third car w.r.t. the either car is
v – (– 30) = (v+30) km/h.
Now (υ + 30) × (4/60) = 5 ⇒ v = 45 km/h