A car moving on a slippery road for 40 minutes is 2/5 of the whole way. How long the car was on the way.

If the car moved for 40 minutes on a slippery road and this made up 2/5 of its entire path, then all the time it will be on the road will be one, and in minutes this time will be designated by the letter X. Let’s compose and solve the proportion:
2/5 – 40;
1 – H.
Where from:
X = 40 x 1 / 2/5;
X = 100 (minutes).
Answer: the whole car was on the way for 100 minutes or 1 hour 40 minutes.