a man can row a distance of 6 km in 60 min with the help of the tide . the direction of the tide reverses with the same speed . now he travels a further 20 km in 10 hours . how much time he would have saved if the direction of tide has not changed ?
"explanation : he covered 6 km in 1 hour , so he might cover 20 km in 3 hours 19 minutes . but he took 10 hours . he would have saved 10 â € “ 3 hours 19 minutes = 6 hours 41 minutes . answer : d"
subtract(10, divide(20, 6))