Question 106156
When a car reduces it speed by 18 km/h, it's wheel is 200 cm in circumference, takes 1 sec longer to make a revolution. What was the car's original speed?
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There is problem here. 200 cm is 2 meters, if it took 1 sec per revolution that would be only {{{((2*3600))/1000}}} 7.2 km/hr, How could you reduce the speed 18 km/h?