Self Maths Puzzle Numerical Ability Time and Work

A person leaves his home at a time when hour hand is between 4-5 and minute hand between 5-6, and when he returns after some time, the hands exchanged their positions. What time did he leave at?

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Self Other Question
Find the number of zeroes in 100^1! *99^2! *98^3! *..... 1^100 If length of a body is increasing gradually 5cm in every 10 minute and if the length of the body is 10 m at 2 pm. then what will be its true length at 10 am morning?