A particle goes from A to B with a speed of 40 km/h and B to C with a speed of 60 km/h . If AB = 6 BC , the average speed in km/h between A and C is

Question

A particle goes from A to B with a speed of 40 km/h and B to C with a speed of 60 km/h . If AB = 6 BC , the average speed in km/h between A and C is,

MARKS App · Accepted Answer

V av = distance travelled time taken ⇒ V av = AB + BC AB 4 0 + BC 6 0 ⇒ V av = 6BC + BC 6BC 4 0 + BC 6 0 V av = 7 × 2 4 0 3 6 + 4 ⇒ V av = 7 × 2 4 0 4 0 ⇒ V av = 4 2 km/h

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