Question

A scooteriest travels at 36 km/hr for 5 hours and at 45 km/hr for 4 hours. Find the average speed.
Chapter.12 Speed, distances and time.
Class.7

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Answer 1

Answer:

40

Step-by-step explanation:

Distance travelled at 36 km/hr = 36*5 = 180 km

Distance travelled at 45 km/hr = 45*4 = 180 km

Distances are same:

Hence, Avg speed = 2*a*b/a+b, where a & b are speeds

Avg speed = 2*45*36/45+36 = 2*45*36/81 = 40 km/hr

Alternatively:

Avg speed= Tot Distance/Total Time = 180+180/5+4 = 360/9 = 40 km/hr

Hope it helps.

Answer 2

Answer:

Hope it's helpful to you

Step-by-step explanation:

Also in class 7th

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