Answer:
Explanation:
Givens
Total distance = 129 miles
Total time = 6 hours
Time on bicycle = t hours
Time walking = 6 - t hours
Rate bicycle = 34 mph
Rate walking = 4
Formula
d = r * t
34 * t + 4*(6 - t) = 129
Solution
Remove brackets
34t + 24 - 4t = 129
30t + 24 = 129 Subtract 24 from both sides
30t = 129 - 24 Combine
30t = 105 Divide by 30
t = 105/30
t = 3.5
Answer
He spent 3.5 hours on the bicycle.