RRB Exam Numerical Ability Clocks and Calendars

How many times in a day,are the hands of a clock in straight line but oppossite in direction?

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RRB Other Question

if 6*5=1625
7*9=6436 and
4*2=19
then 3*1=?
three gardener working all days can plant a filed in 10 days, but one of them having other employment work only half time. in how many days the work will take now to be finished