Question

Megan drove from her house to work at an average speed of 45 miles per hour. The drive took her
20 minutes. If the drive home took her 30 minutes and she used the same route in reverse, what was her average speed going home?
Question 10 options:

30 miles per hour

13.33 miles per hour

26.6 miles per hour

3 miles per hour

Find the LCM of the set of polynomials.


3a3c, 6b4, b2c2
Question 20 options:

18a3b4c3

18a2b4c2

18a3b4c2

18a3b3c2

Answer 1

Answer:

30 miles per hour.

Step-by-step explanation:

First work out the distance from home to work:

Speed = distance / time

45 = d / 1/3           ( Note:  20 minutes =  1/3 of an hour).

d = 1/3 * 45

=  15 miles.

Driving back home:

Speed = 15 / 1/2

= 30 mph (answer).

LCM of  3a^3c, 6b^4, b^2c^2:

LCM of 3 and 6 is 6

of a^3 is a^3

of b^2, b^4 is b^4

and of c and c^2 is c^2.

So the answer is:

= 6a^3b^4c^2