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)
A12 km per hr
B14 km per hr
C18 km per hr
D16 km per hr
A12 km per hr
B14 km per hr
C18 km per hr
D16 km per hr