Question

Distance=100km, time=75 minutes, speed=?

Answer 1

`\large\boxed{80(km)/(h)}`

Explanation:

`speed=(distance)/(times)\\\\\text{We have:}\\\\distance=100km,\ time=75min\\\\1h=60min\to1min=(1)/(60)h\\\\time=(75)/(60)h=(5)/(4)h=1.25h\\\\\text{Substitute:}\\\\speed=(100km)/(1.25h)=80(km)/(h)`

Answer 2

Explanation:

speed= distance/time

time is meant to be in seconds

1mins = 60 secs

75mins =75 x 60 = 4500

distance is meant to be in metres

1metre= 0.001km

100 km = 100 x 1000= 100000

speed =distance/time

speed = 100000/4500

speed=22.22m/s