15 - 3 = 12
12 * 15 = 180 meters total
time = 180 meters/2 meters/sec = 90 sec
EVERY FLOOR OF A 20 STOREY BUILDING IS 5M HIGH.IF A LIFT MOVES 2M/SECOND FIND HOW LONG WILL IT TAKE TO MOVE FROM 3rd FLOOR TO 15th FLOOR
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