In a 140 m race, Pankaj runs at a speed of \(\frac{5}{2}\)m/s. He gives a start of 20 m to Arun and still defeats him by 4 seconds. The speed of Arun is:

1
1.75 m/s
2
1.25 m/s
3
2 m/s
4
1.5 m/s

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