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Ksju [112]
4 years ago
9

Kwan hiked up a hill at 4 km/h and back down at 6 km/h. His total time was 3 h. How long did the trip up the hill take him

Mathematics
1 answer:
pochemuha4 years ago
8 0

Let t=time it took Kwan to go up the hill

Then 3-t=time it took him to go down the hill

Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r

distance up the hill = distance down the hill

distance up=4*t

distance down=6*(3-t)----So:

4t=6(3-t) get rid of parens (distributive law)

4t=18-6t add 6t to both sides

4t+6t=18-6t+6t collect like terms

 

10t=18 divide both sides by 10

<u>t=1.8 hr---------------------------------time to go up the hill </u>

3-1.8=1.2 hr-----------------------------time to go down the hill

Hope this helps

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60 ships.

Step-by-step explanation:

Let the total number of ships in the naval fleet be represented by x

One-third of the fleet was captured = 1/3x

One-sixth was sunk = 1/6x

Two ships were destroyed by fire = 2

Let surviving ships be represented by y

One-seventh of the surviving ships were lost in a storm after the battle = 1/7y

Finally, the twenty-four remaining ships sailed home

The 24 remaining ships that sailed home =

y - 1/7y = 6/7y of the surviving fleet sailed home.

Hence

24 = 6/7y

24 = 6y/7

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y = 168/6

y = 28

Therefore, total number of ships that survived is 28.

Surviving ships lost in the storm = 1/7y = 1/7 × 28 = 4

Total number of ships in the fleet(x) =

x = 1/3x + 1/6x + 2 + 28

Collect like terms

x - (1/3x + 1/6x) = 30

x - (1/2x) = 30

1/2x = 30

x = 30 ÷ 1/2

x = 30 × 2

x = 60

Therefore, ships that were in the fleet before the engagement were 60 ships.

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Answer:

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