Question

A man walks to a coffee shop which is 4 km from his house in 20 minutes. Again, he walks to another shop at the same rate, and the total distance covered by him is 10 km in 50 minutes. What is his speed between the coffee shop and the other shop?

a. 10 km/hr
b. 8 km/hr
c. 12 km/hr
d. 6 km/hr

Answer 1

c. 12km/hr

Explanation:

Speed = distance/time

Coffee shop: Divide distance traveled by time taken to get the speed in km/min, then convert minutes to hours, and finally simplify to calculate the speed in km/hr

4km/20min * 60min/1hr = 240km/20hr = 12km/1hr = 12km/hr

Other shop: Same task, in the question it already says he is traveling at the same rate so this is only useful to check your answer

10km/50min * 60min/1hr = 600km/50min = 12km/1hr = 12km/hr