Osama drove 2 hours longer than Ibrahim at an average speed 4 kilometers per hour faster than Ibrahim. Hamza drove 4 hours longer than Ibrahim at an average speed 8 kilometers per hour faster than Ibrahim. If Osama drove 40 kilometers more than Ibrahim, then how many more kilometers did Hamza drive than Ibrahim?
Students from grade 8 class decided to collect money for earthquake relief. The amount (in SR) collected by each students equals to number of students in the class, If they collected a total of SR8836, how many students were there in the class?
A shopkeeper sells two qualities of coffee at the rates of SR44 per kg. and SR42 per kg, gaining 10% and 20% profit respectively. If he mixes the two variants in the ratio 2:3 and sells the mixture at SR40.7 per kg., what is his gain or loss?