It is 1 mile per 48 seconds.
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(1 mile / 75 seconds) x (3,600 seconds / hour) = 48 miles per hour
48/6.4 = 7.5 Therefore, you would cover each mile in seven and a half minutes, or 7 minutes 30 seconds.
48 seconds 75 miles/1 hour = 1 mile / x hours 75/60minutes = 1 mile / y minutes 75/3600 seconds = 1 mile / z seconds 3600 = 75 z z = 3600/75 z = 48 seconds
There are 5280 feet in one mile. Therefore, the train is travelling at 48 x 5280 = 253440 feet per hour.There are 3600 seconds in one hour. Therefore the train is travelling at 253440 / 3600 = 70.4 feet per second.
1.57 miles in 30 min 48 sec = 1.57 miles in 30.8 min = 3.058 miles per hour (approx).