actual question from Microsoft 70-291 exam

There is a network as follows:

DHCP server - Subnet A - 10.10.10.65 - Router - 10.10.10.93 - Subnet B

5 Client computers in Subnet A:
IP address: 10.10.10.66 - 10.10.10.70
Subnet mask: 255.255.255.192
Default gateway: 10.10.10.65


Server in Subnet B:
IP address: 10.10.10.94
Subnet mask: 255.255.255.240
Default gateway: 10.10.10.93

Clients cannot connect to the server in Subnet B unless the subnet mask of

the server is changed to 255.255.255.192


This does not make any sense to me, any ideas?

Thanks in advance