沙龙（Sharon）乘出租车从办公室回家。她的出租车车费是根据所示的收费标准计算的。 出租车在红绿灯处停留了 1 分 30 秒，行驶了 5 km 的总路程到达沙龙的家。她的出租车车费是多少？ 答: $ ___

1. Calculate the charge for the first 1 km

Charge for first 1 km = $\char36{}3.40$

2. Calculate the remaining distance and the number of 400 m blocks

Remaining distance = $5 \text{ km} - 1 \text{ km} = 4 \text{ km} = 4000 \text{ m}$
Number of $400 \text{ m}$ blocks = $4000 \div 400 = 10$

3. Calculate the charge for the additional distance

Charge for additional distance = $10 \times \char36{}0.25 = \char36{}2.50$

4. Calculate the number of 45-second blocks for waiting time

Waiting time = $1 \text{ min } 30 \text{ s} = 60 \text{ s} + 30 \text{ s} = 90 \text{ s}$
Number of $45 \text{ s}$ blocks = $90 \div 45 = 2$

5. Calculate the charge for waiting time

Charge for waiting time = $2 \times \char36{}0.25 = \char36{}0.50$

6. Calculate the total taxi fare

Total fare = $\char36{}3.40 + \char36{}2.50 + \char36{}0.50 = \char36{}6.40$