Question

a boy takes 15 min to walk to school at a speed of 5km/hr .how many min would he take if he circled at 15km/hr?​

Answer 1

Let the distance of his school from the house be x

⇒ The difference in time =(15−5)min

=10min

= 10/60 hr

= 1/6

⇒ Speed during next journey =10+2=12km/hr

According to the question,

⇒ x/10 - x/12 = 1/6

⇒ x/5 - x/6 = 1/3

⇒ 6x - 5x / 30 = 1/3

⇒ x/30 = 1/3

⇒ X = 30/3

∴ x=10km

∴ x=10km∴ The distance of boy school from house is 10km

Answer 2

Answer: 5 minutes

Explanation:

Distance = speed x time

              = 15 x 5 = 75km

Time = distance / speed

        = 75 / 15

        = 5 minutes