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2015-01-22T20:44:32+05:30

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Distance covered in 2 hours = 15.5 km
distance covered in 1 hours = 15.5/2 = 7.75 km

so 7.75 km is covered in 1 hour.
12.85 km will be covered = 12.85/7.75 = 1.66 hours
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But in book its written 100 hours. :(
book is wrong..