In a 140 m race. Pankaj runs at a speed of m/s the gives a start of 20 m to Arun and still defeats him by 4 seconds.The speed of Arun is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 2 m/s.
Pankaj's time = 140/(5/2) = 56 seconds
Arun's distance = 140 m - 20 m = 120 m
Pankaj defeats Arun by 4 seconds.
Arun's time = 56 + 4 = 60 seconds
Arun's speed = 120/60 = 2 m/s
Hence, the speed of Arun is 2 m/s.