Answer:
162km
Step-by-step explanation:
dis=30km
time=5/12hr
speed =(dis÷time)
30÷5/12
30×12/5=72km/h
sp=72km/h
time=21/4hr
dis= sp×time
72×9/4=162km
Okay I can help you to do your homework.
7 and 1
I think your answers are right.
hope this helps, have a good day :)
