Book Maths Puzzle Numerical Ability Permutation and Combination

An officer goes to his office on scooter at the speed of 40 km/hr but return from office to his home at 50 km/hr. If the travel time both ways is 40 mins,how far is his office from home.

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Book Other Question

Find the next term of the series
230,200,172,148,130,.........
Two bodies A and B start from opposite ends P and Q of a straight road. They meet at a point 0.6D from P . Find the point of their fourth meeting.