MATHEMATICS

JAMB 2018 - Question 28

Mathematics 2018 JAMB Past Questions - Question 28: A boy walks 800m in 20 minutes. Calculate his average age speed in km per hour.

A boy walks 800m in 20 minutes. Calculate his average age speed in km per hour.
A:
B:
C:
D:
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Correct Answer

A

Explanation

Distance = 800m = 0.8kmtime = 20mins = 20h /60 = 1/3hrsspeed = distance /time = 0.8/1/3= 0.8x3 = 2.4km/hrTo calculate the boy's average speed in kilometers per hour, we can use the formula:\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]First, we need to convert the distance from meters to kilometers and the time from minutes to hours.Distance = 800m = 0.8km (since 1km = 1000m)Time = 20 minutes = 20/60 hours = 1/3 hoursNow, we can calculate the average speed:\[ \text{Speed} = \frac{0.8km}{1/3 hours} = 0.8km \times \frac{3}{1} = 2.4km/h \]Therefore, the boy's average speed is 2.4 kilometers per hour.