These questions are based on the following. Each questions is independent of the other questions.
Chari, a postman has to deliver three letters to three different persons Amit, Balu and Chandu. The post office and Amits, Balus and Chandus houses lie on a straight line in that order. Chari starts from the post office with speed of 48 km/hr, reaches Amits house, delivers his letter to Balu and starts from their immediately at 60 km/hr and reaches chandus house. After delivering the letter to Chandu he comes back to the post-office along the same route.
Chari started from the post office at 9:00 a.m. a and came back, after delivering the letters at 10:38 a.m. On the way back from Chandus house to the post office, he travelled at 50 km/hr. At what time did he reach the residence of Chandu, given that the residence of Amits exactly midway between those of post office and Chandus residence?