A vehicle moves on a highway at an average speed of 60 Km/h. In the traffic of the city, the average speed drops down to 30 Km/h. The macro-cellular radius is 30 Km, and the micro-cellular radius is 3 Km. Assume the macro-cellular layer is used on the highways and the micro-cellular in the city. 1. How many handoffs are expected over a journey of six hours on a highway?
2. How many handoffs are there in a one-hour drive through the city?
3. What would happen if there was absolutely no traffic and the vehicle could move at 70 Km/h in the city?
4. What does this show about deciding which layer should handle a call?

Areal estate agent is considering changing her cell phone plan. there are three plans to choose from, all of which involve a monthly service charge of $20. plan a has a cost of $.42 a minute for daytime calls and $.17 a minute for evening calls. plan b has a charge of $.52 a minute for daytime calls and $.15 a minute for evening calls. plan c has a flat rate of $80 with 275 minutes of calls allowed per month and a charge of $.38 per minute beyond that, day or evening. a. determine the total charge under each plan for this case: 150 minutes of day calls and 70 minutes of evening calls in a month. (do not round intermediate calculations. round your answer to 2 decimal places. omit the "$" sign in your response.)c. if the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal? (round each answer to the nearest whole number. include the indifference point itself in each answer.)d. suppose that the agent expects both daytime and evening calls. at what point (i. e., percentage of total call minutes used for daytime calls) would she be indifferent between plans a and b?