Question

A cheetah can cover 50 yards in 5⁄2 seconds. How long will it take a cheetah at the same speed run 80 yards

Answer 1

no of yards covered in 1 sec is 50*2/5 = 20 yards
no of sec.taken to complete 80 yards is 80/20 = 4 seconds

Answer 2

$\frac{2.5}{50}$ = 0.05 seconds (1 yard every 0.05 second)

0.05 x 80 = 4

It'll take the cheetah 4 seconds to run 80 yards