Each week, rosario drives to an ice skating rink that is 120 miles away. the round-trip takes 2.75 hours. if he averages 55 miles per hour on his way to the rink, which equation can be used to find x, the number of miles per hour he averages on his way home?

a.) 120/55 + 120/x = 2.75
b.) 120/55 x 120/x = 2.75
c.) 120(55) + 120x = 2.75
d.) 120(55) x 120x = 2.75

Step-by-step explanation:

Given : Rosario drives to an ice skating rink that is 120 miles away. The round-trip takes 2.75 hours.

To Find : If he averages 55 miles per hour on his way to the rink, which equation can be used to find x, the number of miles per hour he averages on his way home?

Solution:

Distance traveled on going = 120 miles

Speed on going = 55 miles/hour

Distance traveled on returning = 120 miles

Let the speed on returning be x

So,

We are given that Total time of round trip = 2.75 hours

So,

Hence Option A is true .

So, equation can be used to find x, the number of miles per hour he averages on his way home is

d is the correct answer

step-by-step explanation:

x= 8 because 3x = 3 * 8, and 3*8 = 24

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500