Mathematics
An express train is running between two stations with a uniform speed. If the diameter of each wheel of the train is 42 cm and each wheel makes 1200 revolutions per minute, find the speed of the train.
Related Questions
A wheel has diameter 84 cm. Find how many complete revolutions must it make to cover 3.168 km.
Each wheel of a car is of diameter 80 cm. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour ?
The minute hand of a clock is 8 cm long. Find the area swept by the minute hand between 8.30 a.m. and 9.05 a.m.
The shaded portion of the figure, given alongside, shows two concentric circles.
If the circumference of the two circles be 396 cm and 374 cm, find the area of the shaded portion.
