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34 votes
Lena and Ras drive to work. Lena drives 24 miles in 1.5 hours. Ras drives 36 km in 1 hour 15 min. Work out the difference between their average speeds in km/h. 1 mile = 1.6 km

User Grunge Freak
by
3.0k points

2 Answers

16 votes
16 votes

Answer:

3.2 km/h

Explanation:

User Drexel
by
2.6k points
16 votes
16 votes

Answer:

Difference = 3.2 km/h

Explanation:

Given that,

Lena drives 24 miles in 1.5 hours. Ras drives 36 km in 1 hour 15 min.

For average speed of Lena,

d = 24 miles = 38.4 km

t = 1.5 h


v=(38.4)/(1.5)= 25.6\ km/h

For average speed of Ras,

d = 36 km

t = 1h 15 min = 1.25 h


v=(36)/(1.25)=28.8\ km/h

Difference = 28.8-25.6

= 3.2 km/h

So, the difference between their average speed is 3.2 km/hr.

User Hampus Brynolf
by
3.2k points