Question

S1=30km v1=30km/ph. S1=90km. V2=x
Find X if average speed = 60km/ph

Answer 1

Answer:

avg. speed = total distance/ total time taken

60 = 30+ 90/ 1+ 90/x

60 = 120/ x + 90/ x

60 = 120 × x/ x + 90

60 = 120x / x+90

60( x+90) = 120x

60x + 5400 = 120x

120x + 60x = 5400

180x = 5400

x = 5400/ 180

x = 30

HOPE THAT THIS WILL HELP YOU.

Answer 2

Heya ✋

Let see your answer !!!!

(3a + 5b)^2 - 4c^2

= (3a + 5b)^2 - (2c)^2

= (3a + 5b + 2c) (3a + 5b - 2c)

Thanks :))))