Total distance covered away from Kilijaro: 160-10 = 150km
Total distance covered till 9:A0 while returning to Kilijaro: 160-70 = 90
Total distance covered between 8:30 and 9:A0: 150 + 90 = 240
Total time elapsed between 8:30 and 9:A0 = 30 (From 8:30 to 9:00) + 10*A = 30 + 10.A minutes
Speed per minute = 240 / (30 + 10.A)
Answer should be 'A'
Total distance covered till 9:A0 while returning to Kilijaro: 160-70 = 90
Total distance covered between 8:30 and 9:A0: 150 + 90 = 240
Total time elapsed between 8:30 and 9:A0 = 30 (From 8:30 to 9:00) + 10*A = 30 + 10.A minutes
Speed per minute = 240 / (30 + 10.A)
Answer should be 'A'