Question

Steve Fossett completed the first solo balloon circumnavigation of the world after 13.5 days. Assuming the balloon travelled along a circle of diameter 12 750 km, roughly what was the average speed of the balloon in km/h?

A) 12
B) 40
C) 75
D) 120
E) 300​

Answer 1

B) 40

Explanation:

Average speed = distance/time

Distance = 12750 km

Time = 13.5 days = 13.5*24 hours = 324 hours

Speed = 12750 km /324 h = 39.4 km/h ≈ 40 km/h

Correct option is B) 40