Mind Blowing Qr...not really

[topdent1]

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I need help with this problem please

An executive drove from home at an average speed of 30 mph to an airport where a helicopter was waiting. The executive boarded the helicopter and flew to the corporate offices at an average speed of 60 mph. The entire distance was 150 miles; the entire trip took three hours. Find the distance from the airport to the corporate offices.

I got this far:

30t + 60t = 150

What do I do next?

 

[Thundercatz]

I need help with this problem please

An executive drove from home at an average speed of 30 mph to an airport where a helicopter was waiting. The executive boarded the helicopter and flew to the corporate offices at an average speed of 60 mph. The entire distance was 150 miles; the entire trip took three hours. Find the distance from the airport to the corporate offices.

I got this far:

30t + 60t = 150

What do I do next?

Isnt the answer on purplemath? HEHE

 

[topdent1]

yea, but i don't like using those tables. I'm trying to do it another way (if possible). Any ideas?

 

[klutzy1987]

30t+60(3-t)=150

Calculate T and thenuse that to go back to the original equation and calculate the distance based on R*T=D.

Remember though that T represents the car trip. The helicopter trip is 3-t

 

[appleonius]

you can estimate. i didnt use an equation & i'm thinking that it's 150 miles. 30 miles in 1st hr in the car, 60 + 60 miles in the 2 subsequent hours. total is 150 miles in 3 hours. so from the airport, it's 120 miles? is that the answer?

 

[td4azklz]

30t+60(3-t)=150

Calculate T and thenuse that to go back to the original equation and calculate the distance based on R*T=D.

Remember though that T represents the car trip. The helicopter trip is 3-t

Is the answer 60 miles?

Sory, i mean 120.

 

[Streetwolf]

Answer is 120 miles.

 

[klutzy1987]

Yes the answer is 120.
30t-60t+180=150
-30t=-30
t=1
3-t--->3-1=2

R*T=D
60*2=120

 

[td4azklz]

Yes the answer is 120.
30t-60t+180=150
-30t=-30
t=1
3-t--->3-1=2

R*T=D
60*2=120

Yay!!