Answer:
3/5 hour
4 1/3 miles per hour
6 1/15 miles per hour
Step-by-step explanation:
Given that the object is travelling at a steady speed of 8 2/3 miles per hour and covers 5 1/5 miles
Recall that distance = speed * time
hence
5 1/5 miles = 8 2/3 miles per hour * time t
26/5 = 26/3 * t
Multiply both sides by 3/26
26/5 * 3/26 = t
t = 3/5 hour
If the object reduces its speed by 1/2, the new speed
= 1/2 * 8 2/3 miles per hour
= 1/2 * 26/3
= 13/3 miles per hour
= 4 1/3 miles per hour
If the object reduces its speed by 30%, the new speed
= 8 2/3 miles per hour - 30% * 8 2/3 miles per hour
= 0.7 * 8 2/3 miles per hour
= 7/10 * 26/3
= 91/15
= 6 1/15 miles per hour
