SOLUTION: If Alex rides his motorbike at the rate of 75kph, he will arrive home after 20 minutes. However, if the street is wet, he has to slow down to 50 kph. In this condition, how long wi

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Question 559514: If Alex rides his motorbike at the rate of 75kph, he will arrive home after 20 minutes. However, if the street is wet, he has to slow down to 50 kph. In this condition, how long will it take him to reach home?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +t+ = time in hours
In dry conditions,
+d+=+75%2At+ km
+20+ minutes x +1%2F60+ hours/minutes = +1%2F3+ hr
+d+=+75%2A%281%2F3%29+
+d+=+25+ km
------------
In wet conditions:
+d+=+50%2At+
25+=+50%2At+
+t+=+1%2F2+ hrs
It will take him a half hour to reach home