|A) 13.68kmph||B) 31.68kmph|
|C) 41.68kmph||D) 45.68kmph|
Answer: B) 31.68kmph
In this type of question, we will first calculate the distance covered in given time.
Distance covered will be : Number of revolutions x Circumference
So we will be having distance and time, from which we can calculate the speed.
Radius of wheel = 70 / 2 = 35 cm
Distance covered in 40 revolutions will be = 88 m
Distance covered in 1 sec =