A person travels in a car with uniform speed. He observes a mile-stone, which has 2 digits. After one hour he observes another mile-stone with same digits reversed. After another hour he observes another mile-stone with same 2 containing a 0. Find the speed of the car?
>>After another hour he observes another mile-stone with same 2 containing a 0.
I did not understand what this sentence means. is it same 2 digits containing a 0?
Anyway I the possible answers are B or D, in other 3 numbers i.e. 40, 50, 60. the units digit 0 will not change the units digit of the 2 digit miles, and the number can't be reversed.