The motorcyclist passed 4 hours on the dirt road and 3 hours on the highway. All way made 195 km. The motorcyclist's speed on the highway was 30 km/h more than speed on the dirt road. Determine these speeds.


let speed on the dirt road x, then

of the 4th +3 (x +30)=195

of 4 +3rd +90=195

of the 7th =195-90

x =105/7

x =15km/h on the dirt road

15+30=45km/ch on the highway

Answer add