Question

Julia travels in an air plane a distance of 1980 miles. for one-third of distance, the airplane flies at a speed of 620 mph, and for the rest of the distance, it flies at a speed of 540 mph, How long does the trip take ?

Answer 1

Answer:

1st half - 400km at 760km/h

760/400= 1.9

60/1.9= 31.57mins to go 400km

2nd half - 400km at 900km/h

900/400= 2.25

60/2.25= 26.6....mins to go the other 400km

31.57+ 26.67 = 58.24 mins in total

Answer 2

$\huge\bold{\mathtt{\purple{A{\pink{N{\green{S{\blue{W{\red{E{\orange{R}}}}}}}}}}}}}$

$d = 1980 \: miles \\ so...lets \: start \: with \: our \: question \\ \\ 1st \: half \: = 400 \: km \: at \: 760 \: km \: h \\ = \frac{760}{400} = 1.9 \\ = \frac{60}{1.9} = 31.57 \: mins \: to \: go \: 400 \: km$

$\huge{\boxed{\red{\bf{for \: second \: half =400 km \: at \: 900 \: km\h}}}}$

$= \frac{900}{400} = 2.25 \\ = \frac{60}{2.25} = 26.6 \: for \: another \: 4 \: km \\ \\ 31.57 + 26.67 = 58.24 \: mins \:$

$\huge\underline\mathfrak\purple{Bts}$