Final answer:
To calculate Bruce's speed in miles per hour, divide the distance walked (3/4 miles) by the time taken (1/5 hours), which gives an average speed of 3.75 mph.
Step-by-step explanation:
Bruce walks 3/4 miles in 1/5 hours. To find out his speed in miles per hour, calculate the distance walked in one hour by dividing the distance walked by the time taken.
Speed (mph) = Distance (miles) / Time (hours).
So, Speed = (3/4) / (1/5).
Converting 1/5 hour to a fraction with a denominator of 1 to represent an hour, we multiply both the numerator and denominator of 3/4 by 5.
Speed = (3/4) * (5/1) = 15/4 mph
Now, converting 15/4 into a decimal to get Bruce's speed: Speed = 15 รท 4 = 3.75 mph.
Bruce's average speed is therefore 3.75 miles per hour.