Walking 6/7th of his usual speed, a man is 12 minutes too late. What is the usual time taken by him to cover that distance?
Choose the correct choice from the following answers:
A) 1 hour 10 minutes B) 1 hour 82 minutes C) 2 hour 12 minutes D) 1 hour 12 minutes E) 1 hour 62 minutes
New speed = 6/7 of usual speed   Speed and time are inversely proportional.   Hence new time = 7/6 of usual time   Hence, 7/6 of usual time - usual time = 12 minutes   =&gt; 1/6 of usual time = 12 minutes   =&gt; usual time = 12 x 6 = 72 minutes = 1 hour 12 minutes   Answer :1 hour 12 minutes
<result>D</result>
Walking 6/7th of his usual speed, a man is 12 minutes too late. What is the usual time taken by him to cover that distance?