Answer:
idk
Step-by-step explanation:
Answer:
it is a are b but it could be c
1hr 30 mins= 60mins+30mins=90mins
140$=90mins
In one minute, they make 140/90=14/9
in 9 hours=9*60mins=540mins
540*14/9=840
therefore,they make 840$ in 9 hours
21/35 = x/100
cross multiply
2100=35x
x = 60
