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Average speed = total speed / total time taken
S ₁ = 20 km/h
S ₂ = 30 km/hr
Let the distance between the house and school be x
We know that S= D/t
∴ t = D/S
Distance. = 20 + 30 ÷ x/20+ x/30
= 50 ÷ 3x + 2x / 60
= 3000 / 5x
x = 600 km
S ₁ = 20 km/h
S ₂ = 30 km/hr
Let the distance between the house and school be x
We know that S= D/t
∴ t = D/S
Distance. = 20 + 30 ÷ x/20+ x/30
= 50 ÷ 3x + 2x / 60
= 3000 / 5x
x = 600 km
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