Ade cycled for 2 hours at an average speed of 15 km/h. Kali travelled the same route as Ade but it took her 2 hour 15 minutes. What is Kali's average speed to 1 dp?

Question

asked Nov 6, 2022 220k views

1 Answer

Daniel Kilinskas · Answer 1 · 2022-11-10T13:53:10+0000

Answer: 14.0 km/h

Explanation:

First find the distance that both Ade and Kali travelled. Use the time and speed of Ade to find this out:

Distance = Speed * Time

= 15 * 2

= 30 km

Kali took 2 hours 15 minutes to travel 30km. Her speed is therefore:

= Distance / Time

Convert the time to decimal:

Mixed fraction = 2¹⁵/₆₀

= 2¹/₄

Decimal = 2.15 hours

Average speed = 30 / 2.15

= 13.95

= 14.0 km/h