A truck transports goods from City A to City B, traveling 42 kilometers per hour, and is expected to arrive in 6 hours. But in the middle of the trip, because the machine broke down, it took 1 hour to repair it. If it is still required to arrive at B at the estimated time, how many kilometers per hour must be traveled for the remaining distance?
一辆货车从甲城往乙城运货，每小时行42千米，预计6小时到达．但行到一半时，由于机器出了故障，用1小时进行修理．如果仍要求在预计时间到达乙地，余下的路程必须每小时行多少千米？
<result>43</result>