Question

W usng a calculator, paper and pencil, or mental math.

5. Mandy runs 4 km in 18 min. She plans to run in a 15 km race.
How long will it take her to complete the race?

Answer 1

Mandy will take 67.5 mins to complete the 15 km race.

Explanation:

Given:

Mandy runs 4 km in 18 min

She plans to run in a 15 km race.

We need to find how much time required to run 15 km.

4 km =18 min

15 km = time required for 15 km race

By Using Unitary method we get,

Time required for 15 km =
`(18* 15)/(4)=67.5 mins`

Hence time required by Mandy to complete 15 km race is 67.5 mins.