Lara is a skier. She completed a ski race in 1 minute 54 seconds. The race was 475 m in length. Lara assumes that her average speed is the same for each race.

a) Using the assumption, work out how long Lara should take to complete a 700m race. Give your answer in minutes and seconds.

b) Lara's average speed actually increases the further she goes. How does this affect your answer to part a?

Question

Mathematics

Iris Washington

21 July, 11:09

Lara is a skier. She completed a ski race in 1 minute 54 seconds. The race was 475 m in length. Lara assumes that her average speed is the same for each race.

a) Using the assumption, work out how long Lara should take to complete a 700m race. Give your answer in minutes and seconds.

b) Lara's average speed actually increases the further she goes. How does this affect your answer to part a?

+4

Answers (1)

Know the Answer?

Hunter Shelton · Answer 1

a) 2 minutes 48 seconds

b) The time would decrease as it takes less time for Lara to finish the race.

Step-by-step explanation:

Speed = Distance / Time

Speed = 475 / 114

Speed = 4.16m/s

Distance = 700m

Time = Distance/Speed

Time = 700/4.16

= 168 seconds

= 2 minutes and 48 seconds