Correct answer is... 4 m/s It is equal to 787 ft/min. To give an example, Ibis GS-240 with it's climb speed of 4 m/s that takes off from airfield of elevation 100 metres (300 feets) will reach flight level 100 (10,000 feets or 3 km above mean sea level) after about 13 minutes.
Disclaimer: Our articles and data connected to climb speed of Ibis GS-240 are based on public data from various sources. We are very picky to select an reliable data providers, but we cannot guarantee that everything is 100% error-proof. We recommend for any serious purpose - as a rule of thumb - to request offical data about climb speed from manufacturer of Ibis GS-240.