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The speed limit is 55 miles per hour on most highways. We want to find the ratio of Sam’s speed to the US speed limit.

1: 55 mph 2: 55 mph 3: 11 hr mph / yd . 1: 5 yd / hr . . ' 55 mph RET ' 5 yd/hr RET /

The `u s` command cancels out these units to get a plain
number. Now we take the logarithm base two to find the final
answer, assuming that each successive pill doubles his speed.

1: 19360. 2: 19360. 1: 14.24 . 1: 2 . . u s 2 B

Thus Sam can take up to 14 pills without a worry.