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Bob is hiking down a 60-mile country trail. He could hike at 10 mph for the first two hours and then go the rest of the way at 30 mph or he could just go the whole way at 20 mph. How long would each of these options take?

Respuesta :

alexmg617
First Option would take 3 hours and 20 minutes and the Second Option would take 3 hours.
david8644

Answer:

10 mph for two hours and the rest 30 miles per hour: 3 hours and 20 minutes

20 mph all the way: 3 hours

Step-by-step explanation:

In order to solve this you just have to make the calculations for each trip:

If he goes the first two hours at 10 mph, he will travel 20 miles in the first two hours.

THen he still has 40 miles to go, so we just have to divide 40/30 miles per hour

40/30=1.333 so it would take him 1.3333 hours or 1 hour and 20 minutes to finalize the rest of the trip. IN total that would add up to 3 hours and 20 minutes.

The second trip you would just have to divide 60 miles by 20 miles per hour:

60/20= 3 hours

So it would take bob 3 hours to complete with the second speed.

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