Question

math help asap a train travels 100 km in the same the plane covers 350km. If the speed of the plane is 20 km per less than 4 times the speed of the train, find both speeds.; Train speed?; planes speed?

Answer 1

R=train speed
p=plaane speed
t=time
d=st

100=tr
350=pt
p=4r-20

ok so 100 times 3.5=350
times 1st equaton by 3.5
350=3.5tr
350=pt
sub
3.5tr=pt
divide both sides by t
3.5r=p
sub p=4r-20
3.5r=4r-20
minus 3.4 from both sides
0=0.5r-20
add 20
20=0.5r
times 2
40=r
sub
p=4r-20
p=4(40)-20
p=160-20
p=140


plane=140kmph
train=40kmph