Word Problem in Trignometry

Question:
The wheel of railway carriage is 90 cm in diameter and makes 3 revolutions in a second. How fast is the train moving?

Answer:







=848.6/100 m/sec
=848.6/100000 km/sec
=848.6*3600/100000 km/hr
=30.55 km/hr

Note:
1m = 100cm
1km = 1000m
= (1000)(100)
= 100000 cms