At what time between 7 and 8 o'clock will the hands of a clock be in the same straight line but, not together?
Answer: Option D
When the hands of the clock are in the same straight line but not together, they are 30 minute spaces apart.
At 7 o'clock, they are 25 min. spaces apart.
Minute hand will have to gain only 5 min. spaces.
55 min. spaces are gained in 60 min.