Ok, here's what we got.
now, we are gonna find Periphery
=176 cms per rotation
so now it goes for 176 cms per rotation. and we are told about 45, so
according to the speed-distance/time, we must find the distance first.
Now it goes on 45 revolutions per 10 seconds that means it goes on 45*6 revolutions per 10*6 seconds, that means 270 revolutions per minute. and similarly to find the hour rate it goes on 270*60 rotation per hour [1 min*60]
that means it's going on 16200 revolutions per hour. Now multiply the 16200 with the Periphery.
=2851200 centimeters per hour.
Now convert the centimeters into kilometers, that means the answer is.... 28.512 kilometers per hour.
so your answer is 28.512 Km/h.
By the way, nice question. ^_^