Question

50 points for good answ.
car moves with constant speed. from A to B, car had to arrive on time, but he ride half of the road with 2/3v speed. with what speed car has to ride the rest of the road to go on B location on time?​

Answer 1

Answer:

• 2v

Step-by-step explanation:

Let the distance be d and average speed be v.

Half of the distance the speed was 2/3v

Let the speed be xv in the second half of the distance.

Then time is:

• d/v = d/2 : (2/3v) + d/2 : (xv)
• d/v = 3/4(d/v) + (1/2x)(d/v)
• 1 = 3/4 + 1/2x
• 1/2x = 1 - 3/4
• 1/2x = 1/4
• 2x = 4
• x = 2

The rest of the road car has to ride with speed of 2v