A gear set has a pinion with 20 teeth and gear with 40 teeth. The pinion runs at 30 rev/s and transmits power 20 kW. The teeth are 20˚ full depth system and have a module of 5 mm. The length of line of action is 19 mm. The contact ratio is ________
1
1.21
2
1.25
3
1.29
4
1.33
5
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