Two trains are 360 miles apart at 7 a. m. and are traveling on the same track, in opposite directions, moving toward one another. one train is traveling at 40 miles per hour and the other is traveling at 50 miles per hour. at what time will they meet?

at 4 hours after leaving, that is at 11 am

Step-by-step explanation:

1) finding the distance of the meeting point (X):

so for the train 1, the distance is "X"; for the train 2, the distance would be "360 - X"

2) replacing in the ecuation: V = X / t:

train 1: 40 miles/h = (360 - X) / t(1)

train 2: 50 miles/h = X / t(2)

⇒ from (2): t = X / 50 (3)

replacing (3) in (1):

⇒ 40 = (360 - X) / ( X / 50)

⇒ 40 = (50 * (360 -X)) / X

⇒ 40X = 18000 - 50X

⇒ 90X = 18000

⇒X = 18000 / 90 = 200 miles  meeting distance  (4)

replacing (4) in (2):

⇒50millas/h = (200miles) / t

⇒ t = 200miles / 50 miles/h

⇒ t = 4h

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.

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step-by-step explanation: