1.

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Answer»

1. Average speed = Total distance / Total time TAKEN

= S1 + S2/t1 + t2

S1 = 10km

= 10*1000 = 10000m

S2 = 10km

= 10000m

t1 = 20min

=20*60 = 1200sec

t2 = 30 min

= 30*60 = 1800sec

Average speed = 10000 + 10000/1200 + 1800

=20000/3000

= 6.67m/s

2.

we can use the formula 2xy/x + y

so,

2 x 20 x 30/ 20 + 30

12000 / 50

= 240 km/hr



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