Past lahars at Mount Rainier traveled as fast as 70-80 km per hour (45-50 mi per hour) and were as much as 150 m (490 ft) deep where confined in valleys near the volcano.
Tacoma is approximately ~70km from Mount Rainier. If a Lahar travels at speed of 70km/h how much time it will take for the Lahar to reach Tacoma?
https://www.usgs.gov/media/images/mt-rainier-lahar-hazard-map
O half an hour
O 70 min
O 7 hours
O 60 min