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soldi70 [24.7K]
2 years ago
15

A train travels 120km in 2 hours and 30 minutes. What is its average speed in meters per second?

Biology
2 answers:
Lilit [14]2 years ago
5 0
13.3 m/sec
(change 120 km into meters, making it 120,000 m. change 2 hours and 30 min into sec, making it 9,000 sec. v=d/t so you divide meters by seconds, and get 13.3 m/s)
atroni [7]2 years ago
4 0

Answer:

.8 miles a minute

Explanation:

convert 2 1/2 hours to minutes and divide it by 120

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A certain drug is made from only two ingredients: compound A and compound B. There are 5 milliliters of compound A used for every 4 milliliters of compound B. If a chemist uses 255 milliliters of compound A, how many milliliters of the drug will be made?

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4:5 is the same as 4x:5x where 4x is compound A and 5x is compound B.

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Solve for "x":

If amount of compound A is 4x = 255

x = 255/4

------------------------------

Then amount of compound B is 5x = 5(255/4) = 318.75 ml

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Cheers !!!

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