On a 1 km track, Joseph starts at point P and Kumar starts 300 m ahead of P in the running direction. Joseph runs at 7 m/s and Kumar at 4 m/s. How far has Joseph run when he first passes Kumar?

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Accepted Answer

700 m. Joseph must close the 300 m gap at 7-4=3 m/s: 100 s, in which he runs 700 m. (400 m is Kumar's distance.)

On a 1 km track, Joseph starts at point P and Kumar starts 300 m ahead of P in the running direction. Joseph runs at 7 m/s and Kumar at 4 m/s. How far has Joseph run when he first passes Kumar?

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