Answer:
The average speed of the boat is 20 km/hr.
Step-by-step explanation:
Given : A boat that moves 15.0 km across a lake in 45 min.
To find : What was the average speed in km/h ?
Solution :
The distance a boat covered is 15 km.
The time taken by boat to cross a lake is 45 minutes.
Convert minute into hour,
1 hour = 60 minute
1 minute = [tex]\frac{1}{60}[/tex] hour
45 minute = [tex]\frac{45}{60}[/tex] hour
45 minute = 0.75 hour
The speed of the boat is given by,
[tex]\text{Speed}=\frac{\text{Distance}}{\text{Time}}[/tex]
[tex]\text{Speed}=\frac{15}{0.75}[/tex]
[tex]\text{Speed}=20[/tex]
The average speed of the boat is 20 km/hr.
