1.

A bicycle wheel, diameter 70 cm, is making25 revolutions in 10 sec. At what speed in km/h isthe bicycle travelling? {ans-19.8km/hr}​

Answer»

ANSWER:

19.8 km/hr

Step-by-step EXPLANATION:

Diameter=70 CM

PERIMETER of a circle is πd

22/7*70=220 cm

Distance covered in 25 revolutions is 220*25

5500 cm in 10 sec

Speed=Distance/Time taken

Since the answer should be in km/hr,

let us convert 5500 cm into metres

5500 cm=0.055 km and 10 sec =1/360 hrs

55/1000 / 1/360

55/1000*360

55*36/100

1980/100

19.8 km/hr



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