Answer:
Step-by-step explanation:
Let +s+ = the speed of the passenger train
+s+-+20%5D+ = the speed of the freight train
Let +t+ = time in hours for both trains
-------------------------------------
Equation forpassenger train:
(1) +280+=+s%2At+
Equation for freight train:
(2) +180+=+%28+s-20+%29%2At+
------------------------
(1) +t+=+280%2Fs+
Substitute (1) into (2)
(2) +180+=+%28+s-20+%29%2A%28+280%2Fs+%29+
(2) +180s+=+280s+-+5600+
(2) +100s+=+5600+
(2) +s+=+56+
and
+s+-+20+=+36+
The speed of the passenger train is 56 mi/hr
The speed of the freight train is 36 mi/hr
-------------------------------------
check:
(1) +280+=+56%2At+
(1) +t+=+5+
and
(2) +180+=+%28+56-20+%29%2At+
(2) +180+=+36t+
(2) +t+=+5+
OK
(8+12) > side > |8-12|
20 > side > 4, Then 4 cm is the solution.
Whit a triangle solver: http://triancal.esy.es/?a=8&b=12
Answer: x (x - 1)
Step-by-step explanation:
x (x - 1)
Hello!
An integer can be positive, negative, or zero. Given this, the least possible integer value of a number between -5 and -14 is -13.
Answer: A <em>plane </em>
This needs to be 20 characters long so this is ok
