Question 73
EasyOriginal questionFloods kill more people each year than any other danger that comes with a thunderstorm, and many of those deaths could be prevented.
Most people who drown in floods are not swept away from their homes. In the United States, over half of all flood drownings happen when someone drives a vehicle into flood water. The next largest number happen when people walk into or near fast-moving water.
The problem is that people the power of moving water. Just fifteen centimetres of fast-flowing flood water can knock an adult off their feet. About thirty centimetres of rushing water can carry away most cars, and around sixty centimetres can even large vehicles and trucks. Flood water also hides what lies beneath it: the road under the water may have been washed away entirely.
That is why weather services repeat one simple rule: it is never safe to drive or walk into flood water. If a road is flooded, do not try to get through. Turn around, don't drown.
How deep must fast-flowing water be to knock an adult off their feet?
Show the answer and explanation
Correct answer: A
Explanation
The third paragraph says "Just fifteen centimetres of fast-flowing flood water can knock an adult off their feet."
Worth noting
Sixty centimetres is the depth that can sweep away large vehicles.
- Concept
- Matching figures to their meanings
- Typical timeTypical
- 35 s
- Your timeYours
- —
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