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X, Y and Z travel from the same place wi...

X, Y and Z travel from the same place with uniform speeds 4 km/hr, 5 km/hr and 6 km/hr. respectively. Y starts 2 hours after X. How long after Y must Z start in order that they overtake X at the same instant ?

A

`3/2` hours

B

`4/3` hours

C

`9/8` hours

D

`11/8` hours

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