Question
Question: Two cars are moving with same velocity of 30 kmh<sup>-1</sup> maintaining a distance of 5 km between...
Two cars are moving with same velocity of 30 kmh-1 maintaining a distance of 5 km between them. Speed of third car moving in the opposite direction and meeting the two cars at an interval of 240s is
A
45 kmh-1
B
30 kmh-1
C
55 kmh-1
D
35 kmh-1
Answer
45 kmh-1
Explanation
Solution
Time interval,
t = distance between car/relative velocity
= d/vIII + 30
where vIII is velocity of 3rd car and velocity of I or II is 30 kmh-1 or
240/3600 = 5/vIII + 30 or
vIII = ( 15 × 5 - 30)
= 45 kmh-1