Q: 146 (IAS/2000)

The following figure represents time vs. learning curves of two students, Q and R for learning a Mathematics lesson :
Which one of the following inferences can be drawn from the graph ?
question_subject: 
Logic/Reasoning
question_year: 
2000
question_exam: 
IAS
question_sub_subject: 
Reasoning
question_topic: 
Analytical
stats: 
0,544,160,544,32,88,40