Question

In the 2012 Olympics, Usain Bolt ran the 100m dash in 9.63 seconds. Jim Hines won the 1968 Olympic gold with a time of 9.95 seconds. a. Bolt’s time was ___% faster than Hines’. b. Hine’ time was ___% slower than Bolt’s. c. Hine’ time was ___% of Bolt’s.

Answer 1

3.3%

3.2%

103.3%

Explanation:

Bolt's time: 9.63 seconds

Hines' time: 9.95 seconds

a) Bolt’s time was ___% faster than Hines

(Bolt's time - Hines' time)/Bolt's time x 100

(9.63-9.95)/9.63 x 100

= -3.3%

Bolt's time was 3.3% faster than Hines.

b) Hines’ time was ___% slower than Bolt’s.

(Hines' time - Bolt's time)/Hines' time x 100

(9.95-9.63)/9.95 x 100

= 3.2%

Hines’ time was 3.2% slower than Bolt’s.

c) Hines’ time was ___% of Bolt’s.

9.95 is x% of 9.63

9.95 = x% * 9.63

x = 9.95/9.63 * 100

x = 103.3%

Hines’ time was 103.3% of Bolt’s.

!!