Explanation:
one minute equal 60s
3.5 minutes means 3 and half a minute
3 minute = 180s
1/2 minute =30s
therefore 3.5minutes = 210s
1 minute = 90 words
3.5 minutes = 90 * 3.5 = 315 words.
Hence Jim can type 315 words in 3.5 minutes.
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