# Fiery Tanker

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?

### 6 guesses to Fiery Tanker

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• anant

Since it was ignited at the moment the tanker began to move, the fire would have blown the vehicle almost instantaneously

• Dude

Nope, that’s not it. Keep guessing.

• mmg

9.6 minutes

• Dude

Very close but not quite there. Check your math. Keep trying.

• mmg

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

• Dude

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.