Since Diana did 40 situps at a rate of 4 situps/minute, she did situps for 40 / 4 = <<40/4=10>>10 minutes
Hani had to do 3 + 4 = <<3+4=7>>7 situps per minute if Diana did 4 situps per minute.
So over the 10 minutes Hani did 7*10 = <<7*10=70>>70 situps.
Together, the total number of situps they did is 70+40 = <<70+40=110>>110
#### 110