Amotorboat can maintain a constant speed of 10 miles per hour relative to the waterThe boat makes a trip upstream to a certain point in 54 minutes the return trip takes 18 minutes. What is the speed of the current

20 mph.

Step-by-step explanation:

Let the speed of the current be x mph.

54 minutes = 54/60 = 0.9  hours and 18 minutes = 18/60 = 0.30  hours

Travelling against the current:

Speed = distance / time

x - 10 = d /  0.9

With the current:

x + 10 = d / 0.3

Subtract the second equation from the first:

0 - 20 =  d/0.9 - d/0.3

-20 = (d - 3d) / 0.9

-20 * 0.9 = -2d

-2d = -18

d = 9

So x + 10 = 9/0.3 = 90/3

x + 10 = 30

x = 20 mph.

3,6 and 7.

step-by-step explanation:

a) unit place of 37 is 7

so the unit place of cube of 37 will be

7³= 343=3

the answer is 3.

b) unit place of 56 is 6, so the unit place of cube of 56 will be

6³= 216=6

the answer is 6.

c) unit place of 133 is 3, so the unit place of cube of 133 will be

3³= 27= 7.

the answer is 7.

the correct answer is c

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