The tourist

The tourist will cross a 5 km long section in 3 hours. Part of the journey goes at a speed of 0.8 m/s and the other part at a speed of 0.4 m/s. Find the length of the first and second part of the journey.

Correct answer:

a =  1.36 km
b =  3.64 km

Step-by-step explanation:

s=5 km t=3 h v1=0.8 m/s km/h=0.8 3.6  km/h=2.88 km/h v2=0.4 m/s km/h=0.4 3.6  km/h=1.44 km/h  s=a+b a=v1 t1 b=v2 t2 t=t1+t2  s=v1 t1+v2 (tt1) 5=2.88 t1+1.44 (3t1)  1.44t1=0.68  t1=36170.472222  a=v1 t1=2.88 0.4722=1.36 km
b=sa=51.36=3.64 km

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