Let's figure out what information we have and work from there. Car travels 48 kmph. Bus travels for 5 hours for 125 km. This means the bus traveled at 125/5=25 kmph. The average speed of bus, car and scooter is 34.
So if we assign average speed of scooter to be x, 34=(25+48+x)/3. Some algebra here makes x=29. So if the scooter travels for two hours, that means it went 29*2=58km.
Hope that helps!