plzzzz ans fast....it is urgent A man moves on a straight path. He travels total distance
l. He travels half of his journey with speed 10 ms-l. The
remaining part of journey was covered by him with speed
20 m s-l for half of remaining time and with velocity
40 m s-l for other half of remaining time. The average
speed is
(a) 15 m s-l
(C) 60 m s-l
70
(b) —ms
3
(d) 10m s-l
