Final answer:
To find out how long you'll have to wait for your friend to finish an 11km race at an average velocity of 18km/hr, simply divide the distance by the velocity, resulting in approximately 36.67 minutes.
Step-by-step explanation:
To calculate how long you need to wait for your friend to finish an 11km race with an average velocity of 18km/hr, we can use the formula for time, which is distance divided by velocity (time = distance/velocity). In this case, the distance (d) is 11 km and the velocity (v) is 18 km/hr. we get time (t) = d/v, which gives us t = 11km / 18km/hr.
We have to convert the velocity to the same unit as the distance, kilometers to kilometers, and since it is already in those units, we can proceed with the calculation. t = 11/18 = 0.6111 hours.
Since we usually express time in minutes in this context, we can multiply this by 60 to get the time in minutes. 0.6111 hours * 60 minutes/hour = 36.67 minutes.
Therefore, you’ll have to wait approximately 36.67 minutes for your friend to finish the 11km race.