A car from a to B will arrive in 12.5 hours if the planned speed is increased by 20%?

A car from a to B will arrive in 12.5 hours if the planned speed is increased by 20%?

Speed ratio 1:1 + 20% = 1:1.2 = 5:6
The time ratio is 6:5
Planning time 12.5 ÷ (6-5) X6 = 75 hours

A car from a to B, speed than the original increased by 1 / 4, the result is 1.5 hours less than the original?
Answer with proportion

Time is inversely proportional to speed at a given distance
The original plan is to arrive in X hours,
According to the meaning of the question: (1 + 1 / 4) ratio 1 = x ratio (X -- 1.5)
The solution is: x = 2.5,
A: originally planned to arrive in 2.5 hours