Bamboo is the fastest growing plant in the world. Every spring, a spring rain will make the bamboo grow taller. According to observation, bamboo can grow about 84 cm in 24 hours. Early in the morning, Xiao Li measured the height of a bamboo tree to be 2 meters. If the bamboo grows at a constant speed every hour, what is the height of the bamboo after a 4-hour spring rain?
竹子是世界上生长最快的植物．每年春天，一场春雨会使竹子长高很多．据观察，竹子24小时可以生长约84厘米．清早小李测得一棵竹子高2米，如果竹子每小时是匀速生长，那经过一场4小时的春雨后，竹子的高度是多少米．
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