Question

A car travel along four side of a square at speed of 200,400,600 and 800 km/hr. find average speed?​

Answer 1

average speed =total distance/total time

let total distance=4x

we know time=distance/speed

so total time= x/200 + x/400 + x/600 + x/800

therefore average speed =

4x/(x/200 + x/400 + x/600 + x/800)

= 4x/(12x+6x+4x+3x/2400). ie, lcm of 200, 400 ,600, 800

4x/(25x/2400)

=2400*4x/25x

2400*4/25

24*16

=384 km/h

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