A gasoline tanker drives along at a steady 30mph. At the moment it began to move, someone put a hole in the gas tank and ignited it. The flames are following now at a speed of 25mph. After 24 miles it stops. How long before the flames reach it?
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6 guesses to Fiery Tanker |
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July 13th, 2012 | Category: 
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Since it was ignited at the moment the tanker began to move, the fire would have blown the vehicle almost instantaneously
Nope, that’s not it. Keep guessing.
9.6 minutes
Very close but not quite there. Check your math. Keep trying.
I am pretty sure my calculations are correct because I got
Tanker: 1 mile: 2 min
Flames: 1 mile: 2.4 min
Hence 24*1= 24 mile , 24*2= 48 min
Flames 24*1=24 mile , 24*2.4 = 57.6 min
57.6 min – 48 min= 9.6 min
Well MMG, I may have misinterpreted your answer.
9 minutes and 36 seconds is the correct answer.
Time = Distance ÷ Speed and Distance = Speed x Time
The truck travelled 24 miles which took 24 ÷ 30 = 0.8 hours = 48 minutes.
For these 48 minutes the truck was travelling 5mph faster than the flame so managed to get 5 x 0.8 = 4 miles away from the flame.
Once the tanker stopped, the flame then took 4 ÷ 25 = 0.16 hours = 9 minutes and 36 seconds to catch up.
I took you to mean nine minutes and six seconds, but you clearly meant .6 minutes, which would be 36 seconds.
You are today’s winner.