Elitmus Exam Numerical Ability Time Distance and Speed

A train normally covers a certain distance at a speed 60km/hr.however if it were to halt for a fixed time interval in each hour its avg speed reduced to 50km/hr what is the time interval for which the train halts in each hour

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Elitmus Other Question

The unit digit in the expression (36 ^234 * 33 512 * 39^ 180) - (54 ^ 29 * 25 ^123 *31^ 512) ? if y>1 and x>=y then what is the maximum value of log [root x/y]base x + log[y/x]base y?
a)-0.5
b)0
c)1
d)0.5