Question

Duane walks home to his school, a distance of 2 km in 30 minutes. He then cycles to the river, a distance of 5 km in 15 minutes. Finally, he swims a distance of 3 km in 10 minutes. What is Duane's average speed for the whole journey?

Answer 1

Answer:

5km in 15 minutes

Step-by-step explanation:

2km =30km

1km=15minutes

5km is 15minutes

1km is 15÷5

1km is 3minutes

3km is 10minutes

1km= 3.3minutes

Answer 2

Step-by-step explanation:

total distance=2+5+3=10km

total time taken=30min+15min+10min=55 min

$average \: speed = \frac{total \: distance}{time \: taken} \\ avg \: speed = \frac{10}{ \frac{55}{60} } = \ \frac{10 \times 60}{55} = \frac{600}{55}$

so average speed = 10.9 km/hr