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?

A 5
B 15
C 10
D 20

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.  
Bissoy MCQ
#গণিত #Bank Alfalah Ltd #Bank Alfalah Ltd- MTOs Recruitment Test - 2005

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