Avinash walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is

8.3

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7.2

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3.6

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Solution

The correct option is B 7.2
$G i v e n : D i s tan c e b e t w e e n h o m e a n d s c h o o l = 3 k m T i m e t a k e n t o r e a c h s c h o o l = 30 m i n s T i m e t a k e n t o r e t u r n h o m e = 20 m i n s N o w, T o t a l d i s tan c e t r a v e l l e d = d i s tan c e t o r e a c h s c h o o l + d i s tan c e t o r e t u r n h o m e = 3 + 3 = 6 k m T o t a l t i m e t a k e n = t i m e t a k e n t o r e a c h s c h o o l + t i m e t a k e n t o r e t u r n h o m e = 30 + 20 = 50 m i n u t e s = \frac{50}{60} h r (A s, 1 h = 60 m i n s, s o, 50 m i n u t e s = 50 / 60 h) A v e r a g e S p e e d = \frac{T o t a l D i s tan c e}{T o t a l T i m e t a k e n} = \frac{6}{50} \times 60 k m / h = 7.2 k m / h$

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