13. A bicycle wheel, diameter 70 cm, is making
25 revolutions in 10 minutes At what speed in km/h is
the bicycle travelling ?
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D=2r
radius=35cm
2πr=
2 \times 22 \div 7 \times 35
= 220cm
Distance travelled =
220 \times 25
= 5500 cm
speed= 5500cm/10sec
= 5.50m/s
for converting to km/h =
550 \div 100 \times 1000 \div 3600
= 55÷36km/h
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