Heather and Matthew walk eastward with a

speed of 0.90 m/s east.
If it takes them 31 min to walk to the store,
how far have they walked?
Answer in units of km.

change 31min to seconds.

d=v*t

1.6km

To find the distance they have walked, we can use the formula:

Distance = Speed × Time

First, let's convert the given speed from meters per second (m/s) to kilometers per hour (km/h).

1 meter = 0.001 kilometers
1 hour = 60 minutes

So, to convert from m/s to km/h, we can multiply the given speed by (0.001 km / 1 m) and then multiply it by (60 min / 1 hour) to get:

Speed = 0.90 m/s × (0.001 km / 1 m) × (60 min / 1 hour) = 0.90 × 0.001 × 60 km/h

Speed = 0.054 km/h

Now, let's convert the given time of 31 minutes to hours:

Time = 31 min × (1 hour / 60 min) = 31 / 60 hours

Time = 0.517 hours

Finally, we can use the formula above to calculate the distance:

Distance = Speed × Time = 0.054 km/h × 0.517 hours

Distance = 0.028 km

Therefore, Heather and Matthew have walked approximately 0.028 kilometers to the store.