Xiao Ming starts from home to go to school by tram at a speed of 15.6 kilometers per hour, and arrives at school after 5 hours. Now Xiao Ming changes the speed of riding the tram and goes to school at a speed of 17 kilometers per hour. Ask Xiao Ming if he can go to school within 4 hours To school.
小明以15.6千米每小时的速度从家出发骑电车去上学，经过5小时后到校，现小明改变骑电车的速度，以17千米每小时的速度去上学，问小明是否能够4小时内到校．
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