SME
Grade 6 Science · Problem type
When will the front arrive?
Use this for “A front 300 km away moves 30 km each hour. How many hours until it arrives?”
Diagram
Time to arrive: 10 h on the top line sits over 300 km on the bottom line: each 1 above is 30 below.
This is an example. Type your own values to start a new problem.
Distance to the front (km)
÷
Front speed (km/h)
=
Time to arrive (h)
Formulas
300 ÷ 30 = 10
Distance ÷ speed = time to arrive
Assumptions
•
Cold fronts often move about 25 to 50 km each hour; warm fronts about half as fast.
•
A front can speed up, slow down or stall, so the answer is an estimate.
•
Weather maps and radar show how far away a front is.
Step-by-step
WE KNOW
Distance to the front: 300 km
Front speed: 30 km/h
FIND
time to arrive
Step 1 · Find time to arrive
300 ÷ 30 = ?
Distance ÷ speed = time to arrive
Each hour the front moves its speed in km, so count how many of those fit in the distance.
Time to arrive = 10 h
Check
Put the numbers back in. Both sides should match.
30 × 10 = 300 ✓
Topic check
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