A father can do a job in a certain number of hours.  His son takes twice as long to do the job.  Working together, they can do the job in 6 hours.  How many hours does it take the father to do the job alone ?

One printing press can print a daily newspaper in 12 hours, while another press can print it in 18 hours.  How long will the job take if both presses work simultaneously ?

A gas tank is empty.  When full, the tank holds 18 litres.  How many litres are there in the tank now ?

A is twice as good as a workman B, And together, they finish a piece of work in 14 days.  In how many days, can it be done by each separately ?

Savita left her home at 11 a.m., travelling along Route 1 at 30 kmph.  At 1 p.m., her brother Rohan left home and started after her on the same road at 45 kmph.  At what time did Rohan catch up to Savita ?

At the rate of m metres per s seconds, how many metres does a cyclist travel in x minutes ?

A certain copy machine produces 13 copies in every 10 seconds.  If the machine operates without interruption, how many copies will it produce in an hour ?

The earth travels around the sun at a speed of approximately 18.5 kilometres per second.  This approximate speed is how many kilometres per hour ?

Twelve women complete a work in 20 days. If only 8 women are employed, the time required to complete the same work is -

If 3 miles are equivalent to 4.83 kilometers, then 11.27 kilometers are equivalent to how many miles ?