Between 1h and 1h 20m
1h = 3600s 25200s x 1h/3600s = 7h
1h = 60min 477min x 1h/60min = 7.95h = 7h 57min
1h = 3600s 25200s x 1h/3600s = 7h
1h = 60min 4000min x 1h/60min = 666.66667h = approx. 666h and 40min
1h = 60min 1290min x 1h/60min = 21.5h
1h = 60 min so 1h and 20 min = 60 + 20 = 80 min
1h = 3600s 1km/h x 1h/3600s = 0.00027778km/s
Greenwich +1h
Yes, it is correct so say the following: The video is 1h 15min long". All you have to do to improve it is to add a "and" between 1h AND 15min long.
1h 20min
5 W's: * Who? * What? * When? * Where? * Why? 1 H: * How?