单选题
This bar chart shows the heights of a class of pupils.
Which statement must be true?
Height (cm)
2 children are 125 cm tall or less.
8 children are at least 140 cm tall, but less than 145 cm tall.
8 children are more than 144 cm tall, but less than 150 cm tall.
No children are taller than 158 cm
单选题
John can mow a field in 6 hours.
Bill can mow a field in 5 hours.
Henry can mow a field in 4 hours.
Joe can mow a field in 3 hours.
Tom can mow a field in 2 hours.
If they all work together at their respective rates, how long will it take to mow the field?
41.4 minutes.
39.4 minutes.
40.4 minutes.
38.4 minutes.
单选题
Two aeroplanes are flying straight towards each other. One is traveling at 10 kilometres per minute, and the other at 15 kilometres per minute. Assuming that the planes are exactly 1,000 kilometres apart, what distance will be between them one minute before they crash into each other?
. 10 kilometers.
15 kilometers.
25 kilometers.
5 kilometers.
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