Two planes fly toward each other. They are 3500 kilometers apart. They pass each other after 7.5 hours. If their speeds differ by 65 kilometers per hour, what are their speeds?

Given:

Two planes fly toward each other. They are 3500 kilometers apart.

They pass  each other after 7.5 hours.

Their speeds differ by 65 kilometers per hour.

To find:

Their speed.

Solution:

Let speed of one plane be x km/h.

So, speed of second plane is x+65 km/h.

Relative speed = x+(x+65) km/h

We know that,

Multiply both sides by 7.5.

Divide both sides by 15.

Speed of first plane = 200.83 km/h.

Speed of second place = 200.83+65 = 265.83 km/h

Therefore, their speeds are 200.83 km/h and respectively.

the answer would be d

straight away you can eliminate a and c because not all books contain a scientific skill because some may be fiction. c is also wrong because it saids that the only way children can learn is through books which is incorrect.

b is also wrong because reading can be a scientific skill but not always, therefore it is wrong which leaves you with d, the correct answer since it said that it can children learn.

hope this ! : 3

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.