Question

a cyclist travels 20 kilometers in 1 hour and 40 kilometers in 2 hours. what is the cyclists average speed for the entire trip?
a. 0.05 km/hr
b. 15 km/hr
c. 20 km/hr
d. 25 km/hr

Explanation:

Step1: Calculate total distance

The cyclist travels 20 km in the first - part and 40 km in the second - part. So the total distance $d = 20+40=60$ km.

Step2: Calculate total time

The cyclist takes 1 hour in the first - part and 2 hours in the second - part. So the total time $t = 1 + 2=3$ hours.

Step3: Calculate average speed

The formula for average speed is $v=\frac{d}{t}$. Substituting $d = 60$ km and $t = 3$ hours, we get $v=\frac{60}{3}=20$ km/hr.

Answer:

C. 20 km/hr