Biking at 10 mph, it takes Kristen 1/2 hour to reach the train station to go to work. Kristen then takes the train to work, and it takes another 1/2 hour for her to get to work when the train travels 24 mph. How far does Kristen travel to work? A.
65 miles
B.
27 miles
C.
17 miles
D.
16 miles

speed = Distance /Time

10 mph = Distance / 0.5 hours

distance = 10 * 0.5

Distance = 5 miles

speed = Distance /Time

24 mph = Distance /0.5 hours

Distance = 24 * 0.5

Distance = 12 miles

Total distance = 5miles + 12miles

= 17miles

it's answer is C

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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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it is 570

step-by-step explanation: