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lina2011 [118]
3 years ago
12

After driving to a riverfront parking lot, Bob plans to run south along the river, turn around, and return to the parking lot, r

unning north along the same path. After running 3.25 miles south, he decides to run for only 50 minutes more. If Bob runs at a constant rate of 8 minutes per mile, how many miles farther south can he run and still be able to return to the parking lot in 50 minutes?
(A) 1.5
(B) 2.25
(C) 3.0
(D) 3.25
(E) 4.75
Mathematics
1 answer:
mars1129 [50]3 years ago
5 0

Answer:A) 1.5

Step-by-step explanation: Bob runs at the rate of 8mins per mile

In 60mins his rate would be=60/8=7.5

Let a be the distance he further runs south

2s+3.25

Total distance covered in 50mins=Time=distance/speed=

50/60

50/60=2s +3.25/7.5

Cross multiply

60(2s+3.25)=50×7.5

120s+195=375

120s=375-195

S=180/120

S=1.5

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Answer:

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Step-by-step explanation:

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It is clearly visible that:

The given triangle RST has coordinates in first quadrant.

and the resulting coordinates R'S'T' are in third quadrant.

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2 years ago
An instructor gives a class a set of 10 problems and says that the nal exam will consist of a random selection of 5 of the probl
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Answer:

probability that he or she will answer at least 4 problems correctly = 0.5

Step-by-step explanation:

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Since there are 10 problems. 4 is from the 7 problems chosen and 1 is from the 3 problems we can't figure out. Thus, P(exactly 4 correctly) = 7C4 x 3C1

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