A 10 hectare field is reaped by 2 men,3 women, and 4 children in 10 days .If a man , a women and a child work in the ratio 5:4:2 ,a 16 hectare field will be reaped by 6 men,4 women and 7 children ni how many days?
The circumference of the front wheels of a locomotive is 3.5 m and that of the back wheels is 3.0 m .If the locomotive is moving at a speed of 15 m/sec ,the shortest time in which both wheels will make a whole number of turns is ,in sec?