A shop is open from 9am-7pm.The function r(t), graphed below, gives the rate at which customers arrive (in people/hour)at time t.Suppose that the salespeople can serve customers at a rate of 60 people per hour.When do people have to start waiting in line before being served? Answer to the nearest half-hour.You do not need to include "am" or "pm".

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The Answer of A shop is open from 9am-7pm.The function r(t), graphed below, gives the rate at which customers arrive (in people/hour)at time t.Suppose that the salespeople can serve customers at a rate of 60 people per hour.When do people have to start waiting in line before being served? Answer to the nearest half-hour.You do not need to include "am" or "pm".

A Shop Is Open from 9am-7pm