Speed of a car is (v + 4) km/h, which is 9 km/h less than that of bike. Time taken by car to cover 108 km is 20% less than the time taken by bike to cover 162 km. Length of a train is (10v + 10) metres. If speed of train is (v - 6) m/s, then find the time taken (in seconds) by train to cross a man standing on a platform of length 480 metres.