The speed of a motor boat in still water is 50 kmph. If the motor boat travels 60 km against the stream…
The journey takes 100 minutes. The upstream speed is 60/1.5 = 40 km/h, so the stream speed is 50 − 40 = 10 km/h. The downstream speed is 50 + 10 = 60 km/h, giving a time of…
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The speed of a motor boat in still water is 50 kmph. If the motor boat travels 60 km against the stream in 1 hr 30 minutes, then the time (in minutes) taken by the boat to cover 100 km along the stream is
Answer and explanation
Correct answer B
The journey takes 100 minutes. The upstream speed is 60/1.5 = 40 km/h, so the stream speed is 50 − 40 = 10 km/h. The downstream speed is 50 + 10 = 60 km/h, giving a time of (100/60) × 60 = 100 minutes.
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