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The first student will receive 40 * (1/4) = <<40*(1/4)=10>>10 hours of tutoring.
The second student will receive 40 * (3/8) = <<40*(3/8)=15>>15 hours of tutoring.
The total tutoring time for the first and second student is 10 + 15 = <<10+15=25>>25 hours.
Hence, Kimi will be able to provide 40 - 25 = <<40-25=15>>15 hours of tutoring to other students this month. Answer: \boxed{15}.