In a circular path of 600 m, Pankaj and Rohit start walking in opposite directions from the same point at the speeds of 2.85 m/s and 5.4 km/h, respectively. After how many minutes will they meet for the first time? (Rounded off to one decimal point)
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 2.3.
Rohit's speed = 5.4 km/h or 5.4 × 5/18 = 1.5 m/s
the relative speed of Pankaj and Rohit = 2.85 m/s + 1.5 m/s = 4.35 m/s
The distance around the circular path = 600 meters
The time taken to meet for the first time = Distance/Relative speed = 600/4.35 = 137.93 sec
Time in minutes = 137.93/60 = 2.3 minutes