It has become popular for some people to have yearly whole-body scans (ct scans, formerly called cat scans), using x-rays, just to see if they detect anything suspicious. a number of medical people have recently questioned the advisability of such scans, due in part to the radiation they impart. typically, one such scan gives a dose of 12 msv, applied to the whole body. by contrast, a chest x-ray typically administers 0.20 msv to only 6.0 kg of tissue. how many chest x rays would deliver the same total amount of energy to the body of a 85 kg person as one whole-body scan?

Explanation:

Given

One CT scan gives a dose of 12 mSv

and a chest X ray typically administer 0.2 mSv to 6 kg tissue

mass of Person

therefore

N no of x-Ray equals to 12 mSv dose of CT scan

Therefore total no of x ray required is

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the total distance traveled by the car is

30km + 49km = 79 km .