That's a total of 400 square feet.
50 ft
If the given dimensions are in feet then there are 25 times 10 = 250 square feet
200ft squared
25 feet in 3.88 seconds is the same as 4.39 mph
Sq footage = 18*25 = 450 square feet.
25 feet is equal to 7.62 meters.
7.62 metres.
Tonnage is a measure of weight. The sizes you've given are a measure of volume. You need to know the density of whatever you're going to fill the 25x50x7 space with to get from volume to weight.
25feet
25feet
nothing more than 25feet