Khalil took a train from san francisco to san jose, which is a distance of 54 miles. the train took 45 minutes for the trip. what was the average speed of the train expressed in miles per hour?

To find the average speed in miles per hour, you can find the number of miles Khalil traveled per minute and then multiply that by 60 to convert it to hours.

54 miles/45 minutes = 1.2 miles per minute

1.2 x 60 = 72 miles per hour.

Khalil traveled at an average speed of 72 miles per hour.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.