Question

A car milometer shows 15951.    After 2 hours it shows another palindromic number.How fast was the car going on average

Answer 1

afetr 2 hour next palindromic no. is 16061.

hence distance covered in 2 hours = 16061 - 15951 = 110 km.

hence avg. spd = total distance / total time
          
                        $\frac{110}{2}$ =55 km/h is the avg. spd

Answer 2

The next palindromic number would be 16061, so the car will therefore have traveled 110 miles.

Given this was 2 hours later, it must have travelled at an average of 55 miles per hour, which seems reasonable.

The next number would be 16161, which makes 210 miles, or 105 miles per hour which seems less relevant.