A speed boat travels from A to B for the first part of a journey and then B to C to complete a journey. For the entire journey, A to C, the boat travels at an average speed of 21 kmph.
During the journey, from B to C, the boat only travels at a speed of 13 kmph
Calculate the percentage decrease in average speed between the first and second part of the journey, given that the distance off each part is equal.

.mp4 files, because, video

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step-by-step explanation:

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

slope= 1

y-inter slope= 0

x       y

o     0

1       1

2     2

ect.

step-by-step explanation: