Oh, dude, like, 3 times 40 is 120. It's like, you take 3 and multiply it by 40, and boom, you get 120. So, if you're ever in a situation where you need to know what 3 times 40 is, just remember it's 120.
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The overall stopping distance would be around 122m (400ft) This is made up of a thinking distance of 24m (79ft) and an actual stopping distance of 98m (321ft). The thinking distance is around 3m for every 10mph of speed and the overall stopping distance is calculated as follows: 2x20 ft at 20mph 2.5x30 ft at 30mph 3x40 ft at 40mph 3.5x50 ft at 50mph 4x60 ft at 60mph 4.5x70 at 70mph 5x80 at 80mph = 400 ft james s