The sum of two numbers is 100. the first number plus twice the second number is 200. what are the numbers

500 is correct.

Step-by-step explanation:

100 plus 200 twice the second number is 200, (so 100+200+200)= 500

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.