Question

While driving Nikita Travels 30 kilometre with a uniform speed of 40 km per hour and next 30 km with a uniform speed of 20 kilometre per hour find his average speed

Answer 1

Answer:

Explanation:

=> Here,  Nikita Travels 30 kilometre with a uniform speed of 40 km per hour and next 30 km with a uniform speed of 20 kilometre per hour while driving.

Thus, d₁ = 30 km

s₁ = 40 km/h

d₂ = 30 km

s₂ = 20 km/h

Thus, t₁ = d₁/s₁ = 30/40

t₂ = d₂/s₂ = 30/20

=> Therefore, total time taken, t = t₁ + t₂

= 30/40 + 30/20

= 30 + 60 / 40

= 90 / 40

= 2.25 h

=> Total distance travelled, d = d₁ + d₂

= 30 km + 30 km

= 60 km

=> Average speed, s = d / t = 60 / 2.25

= 26.6666667

≈ 26.67 km/h

Hence, the average speed is 26.67 kilometer per hour.