Rate Question involving Exact Hours and Minutes

[angad.patel]

Tom reads at average rate of 30 pages per hour, while Jan reads at an average rate of 40 pages per hour. If Tom starts reading a novel at 4:30, and Jan begins reading an identical copy of the same book at 5:20, at what time will they be reading the same page?
a) 9:30
b) 9:00
c) 8:40
d) 7:50
e) 7:00

[hi4apoorva]

r t d
30 t 30t
40 t-5/6 40t-200/6

30t = 40t-200/6
200/6=10t

t=3 hr 20 min

Ans:
7:50

[Ben Ku]

Please cite the source (author) of this problem. We cannot reply unless a source is cited (and, if no source is cited, we will have to delete the post!). Thanks.