Question from Yesterday
An express train takes 3 seconds to enter a tunnel which is 3 miles long. If it is traveling 120 miles per hour, how long until it passes completely through the tunnel?
Answer:
93 seconds – the train takes 30 seconds to travel 1 mile, and it travels for 3 miles, so that is 90 seconds, plus the 3 seconds to enter the tunnel.
Today’s Problem
Which number is least like the others below:
1, 3, 5, 7, 9, 11, 13