You skate at a rate of 12 feet per second. Your friend skates at a rate of 10 feet per seconds and has a head start of 20 feet. A. How long will it take you to catch Your friend

Correct  t = 10 seconds

Step-by-step explanation:

Given:

V₁ = 12 ft/s , V₂ = 10 ft/s  initial distance d = 20 ft

To the moment  he catches his friend the first skater will have crossed the distance d₁ and the second d₂.

d₁ = d + d₂

d₁ = V₁ · t

d₂ = V₂ · t

when we substitute this into the initial formula we get:

V₁ · t = d + V₂ · t ⇒ d = V₁ · t - V₂ · t  ⇒ d = t (V₁ - V₂) ⇒ t = d / (V₁ - V₂)

t = d / (V₁ - V₂) = 20 / (12 - 10) = 20 / 2 = 10 seconds

t = 10 seconds

God is with you!!!

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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