53. A man drives a motorcycle at the speed of 40 kinhr" for the
first 10 km distance and then at the speed of 60 km hrl for
the next 10 km. His average speed is
(a) 50 km hrad
(b) 48 km Himami
(c) 55 km hrl. (d) 45 km hr!
tell me how to solve
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Time taken in first drive is 10/40=1/4 hours.
Time taken for second drive is 10/60= 1/6 hours .
Total distance covered is 20km
Total Time taken is 1/6+1/4 = 10/24 hours
Average speed = 20 ÷ 10/24
= 20 × 24/10
= 48 km/hr
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