Bunuel wrote:
If John traveled 9 miles on his unicycle, what was his speed in miles per hour?
(1) The unicycle has spokes that stretch the 23 inches from the center of the wheel to inner edge of the wheel.
(2) John pedals his unicycle at 19 revolutions per minute.
Fact:D=9 Miles, t=?, S=?
Question:Speed=Distance/Time=?
Condition1: The unicycle has spokes that stretch the 23 inches from the center of the wheel to
inner edge of the wheel.
Please note it's given as inner edge. Not outer edge which would have given the exact circumference of wheel needed for calculation.
Not Sufficient.
Condition2: he moves at 19Revs/min= 1140 Revs/hr.
But not sufficient.
Condition (1)+(2): Circumference*revs/hr would give the distance travelled in 1 hour in inches/hr unit. Convert it to miles/in 1 hr. Divide 9 Miles/this figure to get the time.
BUT as stated in condition (1) Inner dia would not be accurate to solve this question, for this we need outer dia or circumference.
So, NOT SUFFICIENT.
ANS-E