i) 4 kg of coffee or 2 kg of nuts can be picked by Jara in an hour. On the other hand, 2 kg of coffee or 4 kg of nuts can be picked by Peng in an hour. Moreover, Jara and Peng work for 6 hours in a day. Therefore, maximum kilograms of coffee can be picked if Jara and Peng pick only coffee in the entire day. Thus, Jara can pick a total of 24 kg (4×6) of coffee in the whole day. On the other hand, Peng can pick a total of 12 kg (2×6) of coffee in the whole day. Therefore, Jara and Peng can pick a maximum of 36 kg (24 + 12) of coffee in a day.