Two persons start to walk from a same po...

Two persons start to walk from a same point at the same time, in the same direction to cover a certain distance at the speeds of 3.75 km/h and 3 km/h. If first person reaches his destination before 30 minutes than the 2nd person, find the distance traveled by them.

a)1.8 km

b)6.4 km

c)7.5 km

d)7.2 km

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