Bob drove from home to work at 60mph. after work the traffic was heavier, and he drove home at 25mph. his driving time to and from work was 1 hour and 8 minutes. how far does he live from his job

Let's call the distance between Bob's house and his job " Q miles".

When he drives the distance at 60 mph, it takes him ( Q/60 ) hours to cover it.

When he drives the distance at 25 mph, it takes him ( Q/25 ) hours to cover it.

When he drives both ways, it takes him ( 1hr 8min ) total driving time.

1hr 8min = 68 minutes.  That's 68/60 hours.

(Q/60 hr) + (Q/25 hr) = 68/60 hr

Q/60 + Q/25 = 68/60

Multiply each  side by 60:

Q + 60Q/25 = 68

Now multiply each side by 25:

25Q + 60Q = 1700

85Q = 1700

Divide each side by 85 :  Q = 20 miles

Check:

Driving 20 miles at 60 mph takes 1/3 hour = 20 minutes

Driving 20 miles at 25 mph takes 4/5 hour = 48 minutes

Driving both ways takes (20min + 48 min) = 68 minutes   yay!

the reason why your question keeps getting deleted because this is not a school related question : )

i will answer your question though.

i never tried church's

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.