A driver of an auto rickshaw sees a lorry m ahead of him .After 30 seconds the lorry 90 m behind. If the speed of the auto rickshaw is 38 km /hr, then what is the speed of the lorry?

A 23 km/hr
B 25 km /hr
C 20 km /hr
D 18 km /hr

Correct Answer: 20 km /hr

Relative Speed  = Total distance Total time = 60 + 9030 = 15030 = 5m/s.'. 5m/s  = 5×185 = 18 km/hrNow, relative speed = speed of auto rickshaw  -  speed of lorry ⇒18 = 38 - speed of lory⇒speed of lorry  = 38 - 18 = 20 km/hr 
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