Question

A car at a speed of 80 km /h during first half of its running time and at 40km/h during the other half then average speed of car is

Answer 1

Vavg= 2*40*80÷ (40+80)
= 6400÷ 120
= 53.34 m/s

Answer 2

Answer:

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➤Let us assume that,

➤The car travelled for 2 hour

➢So for one hour,

⇒Distance Travelled = Velocity × Time

⇒80 × 1

⇒80 km

➣For second one hour,

⇨Distance Travelled = Velocity × Time

⇨40 × 1

⇨40 km

⇨Total Distance Travelled = 80 + 40

⇨120 km

$\sf ➯Average \: speed = \dfrac{Total \: Distance}{Total \: Time}$

$\sf ➯\cancel \dfrac{120}{2}$

➾60 km/h.