Final answer:
It takes 75 seconds to inject 150ml of contrast media with an injection rate of 2ml/sec, corresponding to option (b) 75 sec.
Step-by-step explanation:
To determine how long it takes to inject 150ml of contrast media with an injection rate of 2ml/sec, we can use the following formula:
Time (seconds) = Volume (ml) / Rate (ml/sec)
Using the given values, we calculate the time as follows:
Time = 150ml / 2ml/sec = 75 seconds
Therefore, it takes 75 seconds to inject 150ml of contrast media at a rate of 2ml/sec. This matches the option (b) 75 sec.