Didactic test B0

A tourist cycled 28 km on an asphalt road and 25 km on a dirt road, taking 3 hours and 36 minutes in total. At what speeds did the tourist travel each section if he rode 1.4 times faster on the asphalt road than on the dirt road?

Final Answer:

v1 =  17.5 km/h
v2 =  12.5 km/h

Step-by-step explanation:

s1=28 km s2=25 km t=3:36=3 hr 36 min =3+6036=3.6 hr=3.6  v1 =1.4 v2 s1 = v1 t1 s2 = v2 t2 t = t1+t2  t = s1/v1+s2/v2 t = s1/(1.4 v2) + s2/v2  t v2 = s1/1.4 + s2  v2=ts1/1.4+s2=3.628/1.4+25=225=12.5  v1=1.4 v2=1.4 12.5=17.5 km/h



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