Answer:
420 meters
Explanation:
Q. Benjamin is riding a unicycle. The tire of his unicycle has a circumference of 2.8 m, and the tire revolves 1.5 times per second. What is the distance Benjamin travels in 100 seconds? 
 
Given: 
 
Circumference of circular tire = 2.8 meters 
 
Tire revolves per second = 1.5 times 
 
Question asked: 
 
What is the distance Benjamin travels in 100 seconds? 
 
Solution: 
 
Circumference of circular tire means distance covered by the unicycle's tire when it revolves 1 time that is 2.8 meters. 
 
Now, by unitary method: 
 
In 1 second, tire revolves = 1.5 times 
 
In 100 seconds, tire revolves = 1.5 100 
 
 = 150 times 
 
Distance covered by the tire when it revolves 1 time = 2.8 m 
 
Distance covered by the tire when it revolves 150 times = 2.8 150 
 
 = 420 meters 
 
Therefore, Benjamin travels 420 meters in 100 seconds.