Answer:
Simplify the expression.
11
b
−
4
Step-by-step explanation:
9514 1404 393
Answer:
5 seconds
Step-by-step explanation:
Suppose the front parts of the trains meet at point A. Since both are the same length and traveling the same speed, each will pass point A in time ...
time = distance/speed
time = (1/18 mi)/(40 mi/h) = (1/720 h) × (3600 s)/(1 h) = 5 s
That is, the rear part of each train will be at point A 5 seconds after the front part.
The rear parts will pass each other 5 seconds after the front parts meet.
468
You can get this by finding the area of each individual rectangle.
Since 20 is a factor of 40, the least common denominator of 3/20 and 9/40 is 40.
4+4+6+6=12+8=20
hope this helps
