Friday

September 19, 2014

September 19, 2014

Posted by **MB** on Monday, April 19, 2010 at 3:21pm.

- math -
**MathMate**, Monday, April 19, 2010 at 6:58pmSum of speeds = 208 miles/1.6hr=130 mph

Difference of speeds = 10 mph

Faster train = (sum+difference)/2 mph

Slower train = (sum-difference)/2 mph

Explanation:

let f=faster train, s=slower train

S=sum, D=difference, then

S=f+s

D=f-s

Add:

(S+D)=f+s+f-s=2f

therefore f=(S+D)/2

Simlarly, by subtracting,

S-D = f+s - (f-s) = 2s

therefore s=(S-D)/2

**Answer this Question**

**Related Questions**

math - Two trains depart at the same time from the same station and travel in ...

math - Two trains depart at the same time from the same station and travel in ...

math - Supppose two trains leave Holbrook, Arizona, at the same time, traveling ...

math - Two cars leave at the same time from towns that are 460 miles apart and ...

Pre-Calculus-Trig - Two trains depart simultaneously from the same station. The ...

physics - two metra trains are on separate but parallel tracks. One has a speed ...

algebra help - Two motorcyclists start at the same point and travel in opposite ...

math - A northbound train and a southbound train meet each other on parallel ...

Math - An eastbound train and a westbound train meet each other on parallel ...

calculus - two trains are on parallel tracks that are 2 miles apart. If both ...