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Masuma's finish time = 1/2 x Heathe's time = 1/2 x 60 = 30 seconds

Nashrah's finish time = 4 x Masuma's time = 4 x 30 = 120 seconds

Harsha finished 3/4 of the distance by the time Masuma crossed the finish line.

Harsha's time = 4/3 x Masuma's time = 4/3 x 30 = 40 seconds

answer: the answer is 23

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.