Kilometers 81410

The tourist walked 1/4 of the way at a speed of 4.5 km/h, 2/5 at a speed of 4 km/h, and the remaining 7 km at a speed of 5 km/h. How many kilometers did he run, and how long did the journey take him? Calculate the time in a fraction.

Correct answer:

s =  20 km
t =  203/45 = 4 2345 h

Step-by-step explanation:

s3=7 km  4s+52 s+s3=s 4s+52 s+7=s  s/4+2/5 s+7=s  7s=140  s=7140=20  s=20=20 km
v1=4.5 km/h v2=4 km/h v3=5 km/h  s1=s/4=20/4=5 km s2=52 s=52 20=52 20=540=8 km  t1=v1s1=4.55=9101.1111 h t2=v2s2=48=2 h t3=v3s3=57=1.4 h  t=t1+t2+t3=910+2+57=45203 h=4.5111 h

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