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Ok, here's what we got. radius=diameter/2=56/2=28cm

now, we are gonna find Periphery Periphery=2πr =(2)*(3.14)*(28) =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.

=16200*176 =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.

Hello ! Diameter = 56 cm radius = D / 2 = 28 cm no. of revolutions (n) = 45 time ( t) = 10 sec revolutions per second = 45 / 10 = 4.5 revolutions per second Distance(D) covered per second = Perimeter of the wheel × 4.5 Speed = Distance / Time S = 2πr × 4.5 ⇒ S = 176 cm × 4.5 per sec ⇒ S = 1.76 metre × 4.5 per sec ⇒ S = 7.920 metre/sec Hence , The Speed is 7.920 m / sec. Ans. I hope my answer is correct! Please mark as the best if you r satisfied! Thank you!