Westonci.ca connects you with experts who provide insightful answers to your questions. Join us today and start learning! Join our Q&A platform to get precise answers from experts in diverse fields and enhance your understanding. Join our platform to connect with experts ready to provide precise answers to your questions in different areas.

Desrina travels 70 miles at an average speed of 70 mph.
She then travels a further 70 miles.
The average speed for the entire journey is 57 mph.
Assuming Desrina didn't stop, what was her average speed for the final 70 miles to 2 dp?


Sagot :

Total miles = 70 + 70 = 140 miles

Total time = 140 miles / 57 mph = 2.456 hours

Time 1: 70 miles / 70 mph = 1 hour

Time 2:  70 miles / x mph

Total time = time 1  + time 2:

2.456 = 1 hour + 70/x

Subtract 1 hour from both sides:

1.456 = 70x

multiply both sides by x:

1.456x = 70

Divide both sides by 1.456:

x = 70/1.456

x = 48.0769 miles per hour

Rounded to 2 dp = 48.08 miles per hour

Answer:

its 48.07

Step-by-step explanation:

be smart