Today we asked our teacher about the exam questions that had been held last week.
" Andi drive to school at 20km/h and went home at 30km/h. What is the mean of the speed? "
And the answer is :
" He start at 20km/h and went home at 30km/h. We use the Physic way, with the Speed : S/t(s) The teacher(HL) said that to total distance is 2s (cause he start and when home) divided by the time ( 1/20 + 1/30) And finnaly, the answer is 24km/h. CONGRATULATIONS ! "
Only one people in my class answered it correctly, cause he join the Mathematic Olympic maybe. And we totally upset. The teacher said, " Kasin deh lu ! " Lol.
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