Let the speed of car be x km/h
speed of train=x+5 km/h
distance=speed*time
thus distance covered by car:
x*4=4x km
distance covered by train:
7(x+5) km
total distance:
4x+7x+35=255
11x=255-35
11x=220
x=20 km/h
speed of train=20+5=25 km/hr
The person above said they speak English
Minimal grade to barely pass would be a C, but you should review and go for at least a B or B+ if you want to pass with a C in the class as a whole.