Answer:
9/20
Step-by-step explanation:
Step 1:
1/4 + 1/5
Step 2:
5/20 + 4/20
Hope This Helps :)
Total distance /total time=total speed
600÷60=10hrs
300÷75=4hrs
I0-4=6
V=300÷6=50km/h
1.35759 x 10 ⁹
i hope this helped