Tough and Tricky questions: Distance/Rate.
On a reconnaissance mission, a state-of-the-art nuclear powered submarine traveled 300 miles to reposition itself in the proximity of an aircraft carrier. This journey would have taken 1.5 hour less if the submarine had traveled 10 miles per hour faster. What was the average speed, in miles per hour, for the actual journey?
Choose one:
A) 20  B) 40  C) 60  D) 80  E) 100
Say, if speed is 60, 300/40 = 7.5 hrs and 300/50= 
<gadget id="calculator">300/50</gadget>
<output>6</output>
6 hrs (a reduction of 1.5 hr -&gt; Correct answer)   Answer (40)
<result>B</result>
Tough and Tricky questions: Distance/Rate.
On a reconnaissance mission, a state-of-the-art nuclear powered submarine traveled 300 miles to reposition itself in the proximity of an aircraft carrier. This journey would have taken 1.5 hour less if the submarine had traveled 10 miles per hour faster. What was the average speed, in miles per hour, for the actual journey?