Roger uses his lunch break to walk the stairs in his office building. He can walk 2,000 steps in 30 minutes. If his daily goal is 10,000 steps, how many minutes will it take him to reach his goal? Think carefully first, then make a decision:
Each step Roger walks for 30 / 2000 = 0.015 minutes. To walk 10000 steps he'll take 0.015 * 10000 = 150. So, the answer is 150.