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Colt1911 [192]
3 years ago
6

3. A pupil left home for school at a speed of

Mathematics
1 answer:
Sladkaya [172]3 years ago
6 0

Answer:

12 km

Step-by-step explanation:

  • 5h 24min = 5.4 hr
  • time = distance / speed

--------------------------------

time out + time back = total time

d/5 + d/4 = 5.4

multiply both sides by 20 to clear the fractions

4d + 5d = 108

9d = 108

Divide both sides by 9

d = 12 km

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