Answer:
q1: no, she does not have enough money to return the bike at 8:15
equation: (50-40)-(4×5)
=10-20
= -10
(this means she needs 50+10, 60 dollers to return the bike at 8:15)
q2: 7:30
Explanation:
q1: first the q says that she has 50 and she needs to pay 40 to ride the bike from 9 am to 7 pm,
so now she has already used 40 from the 50 she already had, there fore she is left with 10.
the q also tells us the she has to pay 4 per quarter hour, which means 15 min
75÷15=5 (cuz 1 hour = 60 min, 60+15=75)
5×4(cuz she has to pay 4 per 15 min)
=20
but she does not have 20, she only has 10
so... she wont be able to pay that much..
Q2:
she would have to return it after 30 min after 7pm
cuz
4×4=16, 16>10
3×4=12, 12>10
2×4=8, 8<10
so 2×15min= 30
so she would have to return the bike at 7:30 pm