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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 :

Created: 7 years ago | Updated: 1 month ago
Updated: 1 month ago
Bangladesh Bank Bangladesh Bank - Assistant Director - 2016 গণিত সময়, দূরত্ব ও গতিবেগ (Time, distance & speed)
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Best Ans:

প্রশ্ন: 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 :

Note: 
Half = One-half = 1/2
One and a half = 1½ 

 

Here,
one-half of the distance = 6 X ½ = 3 km | So, remaining distance = (6-3) = 3 km
two-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:)

2 years ago
MD. ABU RASHED MOSHARRAF

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