A man drives his car to his office at the rate of 40 km/hour and returns along the same route at the rate of 60 km/hour; his average speed in km/hour for the entire round trip is

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Solution

The correct option is B 48
Let the distance of his office $=$ x km
$∴$ Required Average speed
$= \frac{T o t a l D i s t a n c e}{T o t a l t i m e t a k e n} = \frac{x + x}{\frac{x}{40} + \frac{x}{60}} = 48 k m / h o u r$

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A man drives his car to his office at the rate of 40 km/hour and returns along the same route at the rate of 60 km/hour; his average speed in km/hour for the entire round trip is

The correct option is B 48Let the distance of his office = x km∴ Required Average speed=TotalDistanceTotaltimetaken=x+xx40+x60=48km/hour

The correct option is B 48
Let the distance of his office $=$ x km
$∴$ Required Average speed
$= \frac{T o t a l D i s t a n c e}{T o t a l t i m e t a k e n} = \frac{x + x}{\frac{x}{40} + \frac{x}{60}} = 48 k m / h o u r$