Since 1997, China's railways have been speeding up for many times. There is a train that used to run 80 kilometers per hour. After the speed increase, the speed of this train has increased by 40%. How many kilometers per hour does this train run now?

Since 1997, China's railways have been speeding up for many times. There is a train that used to run 80 kilometers per hour. After the speed increase, the speed of this train has increased by 40%. How many kilometers per hour does this train run now?

80 × (1 + 40%), = 80 × 1.4, = 112 (km); a: now the train runs 112 km per hour

After the speed increase of Jingjing train, it can travel 18 kilometers more per hour than before, which is just 1 / 5 faster than before

Let the original speed be x km / h
X/5=18
X=5*18
X=90
Speed up = 90 + 18 = 108 km / h
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Using the equation solution: if the speed of the fifth large-scale speed increase of China's railway is increased from 120 km / h to 160 km / h on the Lu Ning line
The time from Shanghai to Nanjing is reduced by 37. How many kilometers is the railway line from Shanghai to Nanjing?

The railway line from Shanghai to Nanjing is x kilometers
Then x / 120 = x / 160 + 37.5/60
The solution is x = 300
That is, the railway line from Shanghai to Nanjing is 300 kilometers

In April 2007, China's train speed was increased for the sixth time. The average train speed on a main line increased from 160 km / h to 200 km / h. what percentage of the increase in train speed?

(200-160) △ 160, = 40 △ 160, = 25%; a: the train speed has been increased by 25%