2 Answers

DFectuoso · Answer 1 · 2022-05-03T03:01:09+0000

#1

$\\ \sf\longmapsto 0.14(y-7)+0.04y=0.10y-1$

$\\ \sf\longmapsto 0.14y-0.98+0.04y=0.10y-1$

$\\ \sf\longmapsto 0.18y-0.98=0.10y-1$

$\\ \sf\longmapsto (0.18-0.10)y=-1+0.98$

$\\ \sf\longmapsto 0.8y=0.97$

$\\ \sf\longmapsto y=(0.97)/(0.8)$

$\\ \sf\longmapsto y=1.2$

#2

Let ones speed =x

others speed=x+1.1

ATQ

$\\ \sf\longmapsto 2x+1.1=5.5$

$\\ \sf\longmapsto 2x=4.4$

$\\ \sf\longmapsto x=2.2$

$\\ \sf\longmapsto x+1.1=3.3$

#3

$\\ \sf\longmapsto Speed=(20)/(2)=10mph$

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