Merging is when two lanes of traffic join into a single lane. The driver is expected to adjust their speed to match the speed of the vehicles on the road they are trying to enter, while looking for an adequate space to merge into traffic.
Because you have to adjust your speed and look for an opening, you must yield to traffic regardless of the speed of other vehicles. Therefore, than answer is Choice A.
1 million is 1 x 10^6
1 billion is 1 x 10^9
1 trillion is 1 x 10^12
So 12 trillion miles is 12 x 10^12 which converts to 1.2 x 10^1 x 10^12 = 1.2 x 10^13
