Nazir can wash his car 15 minutes while his son takes twice as long. If they work together how many minutes will the job take them?

Nazir can wash his car 15 minutes while his son takes twice as long. If they work together how many minutes will the job take them? Correct Answer 10

His son can wash the car in (15 × 2 = 30) minutes Nazir can wash 1/15 part of the car in 1 minute His son can wash 1/30 part of the can in 1 minute Together they can wash (1/15 + 1/30 = 1/10) part of the car in 1 minute So, together they can wash the whole car in 10 minutes.  
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