Question

A cyclist rides for 2 hours at 15 km/hr and then for 3 hours at 20 km/hr. What is the average speed (in km/hr) of the cyclist for the entire trip?

• A. 18
• B. 16
• C. 20
• D. 19

Answer 1

Answer:

A. 18

Average speed = Total distance ÷ Total time

Distance covered:

• First part: $( 15 \times 2 = 30 )$ km

• Second part: $( 20 \times 3 = 60 )$km

Total distance = ( 30 + 60 = 90 ) km
Total time = ( 2 + 3 = 5 ) hours

Average speed = $( \frac{90}{5} = 18 )$km/hr

Answer: 18 km/hr