BC = 6 km
<u>/</u><u> </u> ACB = 34°
AC = ?
cos 34° =
=> 0.829 =
=> AC =
=> AC = 7.23763570567
=> AC = 7 km
=> AC = 10 km (nearest tenth)
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How many cups of 1/4 do I need to get 2 2/4 cups
2 answers:
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Let's assume that Kirby walks with a speed
for a time
, and that he runs with a speed
for a time
.
The total time available for Kirby to catch the train is:
and this must be equal to the sum of the two times t1 and t2:
The distance Kirby should cover is
and this should be equal to the sum of the distances covered by walking and by running:
So we have a system of 2 equations:
If we solve the system, we find:
So, Kirby needs to run at least for 8 minutes in order to catch the train.
for a time
for a time
The total time available for Kirby to catch the train is:
and this must be equal to the sum of the two times t1 and t2:
The distance Kirby should cover is
and this should be equal to the sum of the distances covered by walking and by running:
So we have a system of 2 equations:
If we solve the system, we find:
So, Kirby needs to run at least for 8 minutes in order to catch the train.