A scooter runs at a speed of 49 km/hr after repairing and ru

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A scooter runs at a speed of 49 km/hr after repairing and runs at 42 km/hr before repairing. It covers a certain distance in 7 hours after repairing. Howmuch time will it take to cover twice of the distance before repairing?

[SSC CPO 4 July 2017 Morning Shift With Answers]

A 8 hours 10 mins

B 12 hours 20 mins,

C 16 hours 20 mins,

D 18 hours 30 mins,