In a watch, the minute hand crosses the hour hand for the third time exactly after every 3 hrs 18 min 15 seconds of watch time. What is the time gained or lost by this watch in one day?
A man in a train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed in the train travelling?
A Boat running downstream covers a distance of 16 km in 2 hours while for covering the same Distance upstream it takes 4 hours. What is the speed of the boat in still water?