A person has to cover a distance of 6 km in 45 minutes. If he covers one-half of the distance in two-thirds of the total time; to cover the remaining distance in the remaining time , his speed (in km/hr ) must be :

A 6
B 8
C 12
D 15

Correct Answer: 12

Note: Half = One-half = 1/2One and a half = 1½  Here,one-half of the distance = 6 X ½ = 3 km | So, remaining distance = (6-3) = 3 kmtwo-thirds of the total time = 45 X ⅔ = 30 min | remaining time = (45-30) = 15 min∴ Speed =  [∵ 1 hr = 60 min]                = 12 km/hr (Ans:)
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