A biker rides his sports bike at a speed of 50 km/h for 10 km and then increases his speed to 120 km/h for 30 km. What was his average speed during his road trip? Give your answer correct to 2 decimal places.

88.89 km/h

Step-by-step explanation:

Total distance travelled,

D = 10 + 30 = 40 km

Total time taken,

T = (10/50) + (30/120) h

= 0.2 + 0.25 h

= 0.45h

Average speed

S = total distance / total time

= D/T

= 40/0.45 km/h

= 88.89 km/h