Subject: General Aptitude · Chapter: Area · Exam: 2008 · Marks: · Difficulty:
The circumferences of the front and rear wheels of a bicycle are 3.5 m and 3 m respectively. If the vehicle is moving at a speed of 15 m/sec, the shortest time in which both the wheels will make a whole number of turns is
(a)1.4 seconds
(b)2.1 seconds
(c)4 seconds
(d)6.4 seconds
Answer
Answer (as printed): A
Explanation
Time taken by front wheel to complete one revolution $$=\left(\frac{3.5}{15}\right) \sec =\frac{7}{30} \sec .$$ Time taken by rear wheel to complete one revolution $$=\left(\frac{3}{15}\right) \sec =\frac{1}{5} \sec .$$
Explanation as extracted from the printed page; notation may be imperfect.