Question

In 1991, an American, Ann Trason, set a world record by running 1000 km in 7 hours, 50 minutes, and 9 seconds. Which is the best estimate of her average speed? (HINT: Think rate)
A. 14 km per hr
B. 12 km per hr
C. 18 km per hr
D. 16 km per hr

Answer 1

We know, speed = distance / time
Here, distance = 1000 Km
t = 7 5/6 = 47/6 hours

S = 1000 * 6 / 47
S = 6000 / 47
S = 127.65 Km/h

[ Please check your distance would be 100 Km i guess, if yes, then your answer will be B) 12 Km/hr ]

Hope this helps!