Samantha is running a race that is x meters. She runs the first 40% of the race at y meters per second and the remainder of the race at z meters per second. How long, in seconds, does it take for Samantha to finish the race? A detailed explanation please :)

solution,

Let race be X meters.

Total time taken:

hope this helps...

Good luck on your assignment...

t= 0.2x (2/y + 3/z)

Step-by-step explanation:

Distance:

40% of the race= 0.4x

60% of the race= 0.6x

Speed:

y m/s at first part and z m/s at second part

Time:

time= distance/speed, it also consists on 2 parts due to different speed

t= 0.4x/y + 0.6x/z

or

t= 0.2x (2/y + 3/z) seconds is the answer

where did you get them? if you picked from the grass, is is probably poisonous.

step-by-step explanation:

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6