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Inga [223]
3 years ago
8

A bird leaves its nest and travels 12 miles per hour downwind for x hours. On the return trip, the bird travels 2 miles per hour

slower and has 3 miles left after x hours.
What's the distance of the entire trip?
How long does the entire trip take?
Mathematics
2 answers:
aalyn [17]3 years ago
6 0
12x = 10x + 3

Subtract 10x from both sides

2x = 3
Divide by two on each side

x = 3/2 or 1 1/2 hours



Distance of the trip:

12 * 2 * 3/2 = 36 miles

How long does the trip take:

3/2 + 3/2 + 3/10 = 3 3/10 hours
steposvetlana [31]3 years ago
5 0

Answer:

a) 36 miles

b) 3.3 hours

Step-by-step explanation:

Given:

Downwind speed of the bird = 12 mph

Time for travel = x hours

Speed at the return = 12 mph - 2 mph = 10 mph

Distance left = 3 miles

Now,

The distance covered at 12 mph = 12 × x = 12x

now,

distance covered with speed 10 mph in x hours = 10x

also,

10x + 3 = 12x

or

2x = 3

or

x = 1.5 hours

Therefore,

the distance of the entire trip = 2 × 12x = 2 × 12 × 1.5 = 36 miles

Now,

the time taken to complete remaining 3 miles while returning = \frac{3}{10}=0.3 hours

hence,

the total time for the entire trip = 2 × 1.5 + 0.3 = 3.3 hours

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s2008m [1.1K]
Answer:
- 0.944

Step-by-step explanation:
We know that,
cos 3A = 4 cos³A - 3 cos A (formula)

So,
If cos A = 0.4,

cos 3A = 4 cos³A - 3 cos A
cos 3A = 4 × (0.4)³ - 3 × (0.4)
cos 3A = 4 × 0.064 - 1.2
cos 3A = - 0.944


Hope it helps ⚜




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