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Ten years ago, the age of the father and the son were in the ratio 6 : 1 and 10 years hence the ratio will become 2 : 1. The present age of the father is

 Ten years ago, the age of the father and the son were in the ratio 6 : 1 and 10 years hence the ratio will become 2 : 1. The present age of the father is
a. 35 years
b. 25 years
c. 30 years
d. 40 years - ans
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It takes 10 days for digging a trench of 100 m long, 50 m broad and 10 m deep. What length of trench, 25 m broad and 15 m deep can be dug in 30 days ?

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