A motorboat in still water travels at speed of 26 kmph. It goes 42 km upstream in 1 hour 45 minutes. The time taken by it to cover the same distance down the stream will be:

• ক 1 hr
• খ 1 hr 45 min
• গ 1 hr 30 min ✅ সঠিক উত্তর
• ঘ 2 hr 30 min