There is insufficient information. A car cannot be "going at 10 km" - it must be 10 km per hour or per 20 minutes, or per 2 hours.
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To travel 50km at 10km/h it will take 5 hours (time = distance/speed). 5 hours x 3600 = 18000 seconds.
Every hour, it would travel 10 km, so after 5 hours, it would have traveled the full 50 km. If you want that in seconds, convert hours to seconds a multiply by your 50. How many seconds in a minute? 60 How many minutes in an hour? 60 So, how many seconds in an hour? 60x60=3600
If you are going at 50km per hour then it would take you 1 hour and 36 minutes to travel 80km. This time will only happen if you travel at 50km the entire time.
Five hours
It would take five hours.