(b) The speed of the vehicle is written as 90 km/h. State the speed in SI unit. Show your working in the space below.

Explanation:I don't say you to mark my ans as brainliest but if it has really helped you plz don't forget to thank me...

90 km/h = 25 m/ s

Explanation:

to understand

1 km = 1000 m

1 h = 60 minutes and since 1 minute = 60 s you can see that 1 h = 60 * 60 s

90 km / h = 90 1000m / 3600 s

90 *1 / 3.6

90/ 3.6

25 m/ s

so 90 km/h = 25 m/ s

(by the way 90 m/s = 3.6 * 90 = 324 km/ h )