On a circular path of 693 m, Sujata and Anjali start walking from the same point but in opposite directions at speeds of 2.85 km/h and 1.5 m/sec, respectively. When will they meet for the first time?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. After 5.04 minutes.
Length of the circular path = 693 m = 0.693 km
Speed of Sujata = 2.85 km/h = 2.85 km/h
Speed of Anjali = 1.5 m/s = 1.5 × 18/5 = 5.4 km/h
Relative speed in opposite direction = Speed of Sujata + Speed of Anjali = 2.85 + 5.4 = 8.25 km/h
Time = Distance/Speed
= 0.693/8.25 = 0.084 hours
= 0.084 × 60
= 5.04 minutes
So, after 5.04 minutes they will meet first time.