Final answer:
Martin took approximately 6 hours and 15 minutes to complete the 66-kilometre cycling race at an average speed of 10.56 km/h. The calculation was done by dividing the distance by the average speed and then converting the decimal hours to minutes.
Step-by-step explanation:
To calculate the time Martin took to complete the 66-kilometre cycling race at an average speed of 10.56 km/h, we use the formula for time, which is the distance divided by the average speed:
Time = Distance / Average Speed
Time = 66 km / 10.56 km/h
Time ≈ 6.25 hours
To convert hours into hours and minutes, we take the decimal part and multiply it by 60:
0.25 hours x 60 minutes/hour = 15 minutes
So, Martin took approximately 6 hours and 15 minutes to complete the race.