a balloon is inflated from 0.04000 l to 0.8000 l against an external pressure of 8.00 atm. how much work is done in joules? 101.3 j = 1 l × atm

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?