Answer :
Answer:
A) speed = 10.5 miles per hour
B) Time taken by him = 1.714 hours
C) Distance = 10.5 mph × 7 hours = 73.5 miles
Step-by-step explanation:
Given as :
The distance cover by David = [tex]\frac{21}{4}[/tex] miles = 5.25 miles
The time taken by David = [tex]\frac{1}{2}[/tex] hours = 0.5 hours
Let the speed = x mile per hour
So, Distance = Speed × Time
A)or, Speed = [tex]\frac{Distance}{Time}[/tex]
Or, Speed = [tex]\frac{5.25}{0.5}[/tex]
∴ speed = 10.5 miles per hour
B) Again The Distance cover by him = 18 miles
SO, with speed 10.5 miles per hour
The Time taken by him = [tex]\frac{Distance}{speed}[/tex] hours
Or, Time taken by him = [tex]\frac{18}{10.5}[/tex] hours
∴ Time taken by him = 1.714 hours
C) Again the Time taken by him = 7 hours
So, Distance cover by him with speed 10.5 mph
Or, Distance = 10.5 mph × 7 hours = 73.5 miles
A) speed = 10.5 miles per hour
B) Time taken by him = 1.714 hours
C) Distance = 10.5 mph × 7 hours = 73.5 miles Answes